Bought mine through ebay for £70 as I wanted a band which could count my steps but also wanted it to be a watch and while i was at it, I thought it may as well be a smart watch. Plumped for the Sony Smartwatch 3
At first the battery life was shocking, thought i had made a mistake as the watch lasted less than a day, but a firmware upgrade sorted that and now easily get 2 days of light use.
So yes, the watch tells the time and it counts my steps so job done but I wanted to unleash the watch and it did not play with IOS so I bought a Sony Xperia Z3 compact and the IPhone 5 now sits as my bedside table device.
Now fully attached to the Sony phone with android wear and this watch rocks.
Phone calls show on watch, as do texts and you can reply to the texts without getting your phone out - Knight Rider style. Drop in some 'Okay Google' and any question is a glance and a question away - Great for currency converting when in the usa and excellent for google maps and driving as the watch shows the next navigation instruction and saying 'Okay Google take me to nearest Walmart' and the watch grabs the information and navigation and opens on the watch and phone.
I could go on about Sky Sports updates, Footy live score updates and many other great features a smart watch adds.
Did I want a smart watch, did I need one?
Nope
Now I have one, would I do without it?
Nope, I am a full convert of the smart watch
Sony's watch has GPS on the watch and its waterproof (1.5mtrs) and dust proof which helps as I work in a very dusty environment and I just wash my watch down when washing my hands and its as good as new.
Like it so much, bought a extra rubber strap and the metal strap which makes the watch look like the dogs nads - Paid £70 for a metal strap but its so worth it.

I've got got the Moto 360 and Sony Smartwatch 3 and I'd suggest:

Moto 360
Positives
- very smart
- loads of stunning community made watchfaces available in the WatchMaker app, look amazing on that almost zero bezel screen
Negatives
- processor is ancient, so can be laggy plus not so future proof
- battery life is terrible if you're a heavy user
- screen is never alwyas on (even with ambient mode)
- doesn't feel like a watch to wear while doing the DIY!

Sony Smartwatch 3
Positives
- feels tough, I never feel I need to take it off to protect it
- great for sport - you can track swimming and running with it
- screen is always on and completely readable in sunlight, so great for digital info-filled watchfaces
- battery should last the day without stressing
Negatives
- not very 'dressy' feeling, optional stainless steel strap is virtually impossible to buy
- shaped like an Apple Watch, so prepare to answer the inevitable question....
- if you like reproduction watchfaces, they don't look great due to the large Bezel and square screen.

tl;dr: If you like bling get the Moto 360, if you value practicality and tech get the Sony SW3....

cheaper on eBay for new, buy it now.

quite a few on eBay which are more expensive too! plus you get a decent guarantee with Amazon.

Same price in argos on black Friday deal.

Amazon all the way. I would be happy even paying slightly more when using Amazon.Their returns and service is outstanding.

Is it waterproof?

so big

This is a great watch. Well worth £99

Had one of these in daily use for about 8 months, very happy with it.