Very happy with mine, tldr details below, hopefully someone finds it helpful.

Mine is the same model but with the slightly older E3-1225v3 CPU. Along with running Windows 10 on it, I have a flaky iMac and so made a backup image of the iMac's MacOS boot drive to an SSD, put that in the TS140 and run the Lenovo as a dual boot machine to a Dell monitor, though at the moment I mainly use the TS140 with Windows 10. It's reassuring that when the iMac dies, I have the backup reassurance that my workflow will only be slightly inconvenienced (it's the 27" 2010 iMac with the screen issues). The TS140's 4 core Xeon CPU is the equivalent of an i5 4570 or i5 4590 but with a larger cache. The integrated graphics is a variant of the Intel HD 4600 (I had to modify my bootloaders config.plist to get this 'P' variant it to work in the MacOS but it works well and Windows recognised it without issue).

Mine came with a 450W platinum power supply (there are two versions of this model, one lower power bronze-rated PSU) with one six pin PCI power plug for a graphics card. eBuyer specify the model is the 70A50022UK, which I think, though don't quote me on this, is the 450W pus model but it could be that the version eBuyer are currently seeking is the version with the 280W 80 PLUS Bronze PSU, so, depending on your usage, you might want to confirm with a phone call to eBuyer. At some point, for my 450W PSU model, I want to get a SATA power to PCI power converter adapter, so I can put my MSI GTX 670 in it, which takes two six pin pci power plugs. If that's not stable, I will replace the power supply but note that the supplied PSU and motherboard uses a proprietary socket, or at least it has a different number of pins, so you will need an adapter if buying a regular desktop PC power supply.

Build quality is great, or at least the time of purchase, I was surprised and delighted, very solid (reassuringly heavy and correspondingly fairly quiet; mine came with a slightly noisy case fan but simply re-seating it helped a bit and I will probably replace it at some point, anyway). I am not a fan of the laptop style DVD drawer but it works well. The quick change hard drive clip on caddies are a nice touch. Upgrade options and connectivity are a bit limited but then it's a server, so not directly comparable to a desktop PC, though it works well for me as one. I added a USB 3 hub. Hope this helps someone. Looking at the picture of the internals, assuming the picture is up to date, it looks pretty much the same as my TS140, as far as I can see, and I am happy to answer questions.

Hot for the price, even if the CPU is now slightly dated. I got mine with cash back from Lenovo, which came through promptly compared to my battle with HP (though in fairness to HP, they did eventually sort out the mistake and I got my cash back from them, too), but £260 without cash back, especially if it is the version with the 450W platinum-rated PSU, is a good deal.

The ZOTAC GeForce® GTX 1060 Mini fits no problem and doesn't foul the usb 3.0 header.

I got a TS140 in January for my son to game on. There is no coil whine and the gpu and system fans all work fine and not at full tilt all the time (infact they never spin loudly even gaming all day long and I've checked the temps). The machine is actually incredibly quiet and hasn't had any lockups, unexpected shutdowns. I think the fan's must be temperature controlled and half the heat from the card goes into the case but it doesn't lead to a problem or fan noise.

You can take the lower HDD drive bay out to fit a long card, mine seemed welded but there's actually a little metal tab on the side that has a bend in it to hold the bay in place after you take the screw off, mine needed a little gentle manipulation with a small screwdriver to free it.

Originally I had planned on getting a bargain RX 470 and live without the front USB ports when I sized it up, but changed my mind and just paid the extra for a 1060. Even though I really wanted value for money, I knew i'd think about those front ports each time I glanced at it. So I put the bay back in, went back in no issues. I couldn't find a short enough RX 470/480 to keep the front USB ports. The RX460 or 1050ti I felt were a waste as I wouldn't need to use the 6pin connector from the PSU (which is cable tied to one the the drive bays) and aren't as powerful.

You might also need low profile angled sata cables if you want to use a long card as it seemed the card would go right over the top of some of them. You might also need a card without a backplate if using a long one as the slot seemed awfully close to the ram clips.

I put in a 6GB 1060 not the 3GB, which would have done for 1920x1080, as I got the LG 25UM58-P which is 2560x1080, it's also 75hz you can set in the control panel.

I got a stick of 4GB RAM off ebay for £17 I was fairly careful choosing some as people seemed to report that it's a bit fussy. Be careful you don't buy 'registered/buffered' ram. I can tell you Hynix HMT451U7BFR8A-PB or HMT351U7EFR8A-PB work. You can go through the list of builds here http://www.userbenchmark.com/System/Lenovo-ThinkServer-TS140/7044#Benchmarks and pick out the ram model numbers for the machines with the same processor to find compatible ram. I think you can mix ecc and normal ram also.

Windows 10 went on no problem (key from SCDKEY listed on HUKD) and had the necessary initial drivers.
I downloaded the windows 10 media creation tool here https://www.microsoft.com/en-gb/software-download/windows10 and put it on DVD.

Thanks for taking the time to write such an informative response.

Do note that the Xeon E3-1226v3 doesn't have HT making it more an i5 rather than i7 as you might expect from a Xeon.
http://ark.intel.com/products/80917
If you want to look up Xeon specs, the wiki has a good overview and usually links back to ark.intel.com so you can verify nobody made a mistake with that list.
https://en.wikipedia.org/wiki/List_of_Intel_Xeon_microprocessors#.22Haswell-WS.22_.2822_nm.29

Do note that the Xeon E3-1226v3 doesn't have HT making it more an i5 rather than i7 as you might expect from a Xeon.
http://ark.intel.com/products/80917
If you want to look up Xeon specs, the wiki has a good overview and usually links back to ark.intel.com so you can verify nobody made a mistake with that list.
https://en.wikipedia.org/wiki/List_of_Intel_Xeon_microprocessors#.22Haswell-WS.22_.2822_nm.29

Any particular issues to look out for?

Awesome, I'm waiting for the Yodel guy to turn up with mine and you had me worried for a second :laughing:

I looked at this earlier but ended up getting the Dell T20.
Horses for courses
heat

Very happy with mine, tldr details below, hopefully someone finds it helpful.

Mine is the same model but with the slightly older E3-1225v3 CPU. Along with running Windows 10 on it, I have a flaky iMac and so made a backup image of the iMac's MacOS boot drive to an SSD, put that in the TS140 and run the Lenovo as a dual boot machine to a Dell monitor, though at the moment I mainly use the TS140 with Windows 10. It's reassuring that when the iMac dies, I have the backup reassurance that my workflow will only be slightly inconvenienced (it's the 27" 2010 iMac with the screen issues). The TS140's 4 core Xeon CPU is the equivalent of an i5 4570 or i5 4590 but with a larger cache. The integrated graphics is a variant of the Intel HD 4600 (I had to modify my bootloaders config.plist to get this 'P' variant it to work in the MacOS but it works well and Windows recognised it without issue).

Mine came with a 450W platinum power supply (there are two versions of this model, one lower power bronze-rated PSU) with one six pin PCI power plug for a graphics card. eBuyer specify the model is the 70A50022UK, which I think, though don't quote me on this, is the 450W pus model but it could be that the version eBuyer are currently seeking is the version with the 280W 80 PLUS Bronze PSU, so, depending on your usage, you might want to confirm with a phone call to eBuyer. At some point, for my 450W PSU model, I want to get a SATA power to PCI power converter adapter, so I can put my MSI GTX 670 in it, which takes two six pin pci power plugs. If that's not stable, I will replace the power supply but note that the supplied PSU and motherboard uses a proprietary socket, or at least it has a different number of pins, so you will need an adapter if buying a regular desktop PC power supply.

Build quality is great, or at least the time of purchase, I was surprised and delighted, very solid (reassuringly heavy and correspondingly fairly quiet; mine came with a slightly noisy case fan but simply re-seating it helped a bit and I will probably replace it at some point, anyway). I am not a fan of the laptop style DVD drawer but it works well. The quick change hard drive clip on caddies are a nice touch. Upgrade options and connectivity are a bit limited but then it's a server, so not directly comparable to a desktop PC, though it works well for me as one. I added a USB 3 hub. Hope this helps someone. Looking at the picture of the internals, assuming the picture is up to date, it looks pretty much the same as my TS140, as far as I can see, and I am happy to answer questions.

Hot for the price, even if the CPU is now slightly dated. I got mine with cash back from Lenovo, which came through promptly compared to my battle with HP (though in fairness to HP, they did eventually sort out the mistake and I got my cash back from them, too), but £260 without cash back, especially if it is the version with the 450W platinum-rated PSU, is a good deal.

Just got mine, wondering is there really four hard drive bays?
I've found three, which is all I need anyway. Plenty of room for a fourth under the DVD drive but looks like it would need something to hold it in place.

What OS have you got on it out of curiosity?

Drive bay locations:
http://www.lenovo.com/psref/pdf/PSREF_TS140_WE.pdf

And Lenovo have finally delivered a server to a HUKD member :smirk:. The debacles of the TS140 at Christmas and the TS150 in February have put me off.