no, no, no,

completely different. for example, they all have the same ssid and you get automatically assigned the mesh with the strongest signal to where you are.

I've yet to see a bad review with the biggest complaint saying £299 is expensive (so it's nearly half price here)

http://www.trustedreviews.com/bt-whole-home-wi-fi-review

This is An AC access point so if you still have your issue when strong signal I suggest the issue is with your router or internet connection. Could be the wireless chip in your TV may only be n rather than ac.

The routing function is different to these, they act as wireless access points, the important part is the seamless transfer, setting the SSID to be the same will only help if the device will automatically switch, the theory with having it in a kit and therefore mesh (true or own version) is that is handled by the access points, I always suggest it is better to have a separate router and access point but the issue up until now has been this has generally meant you required good understanding of enterprise networks and the associated CLI, with this kit you get the features but the easier home user friendly UI.

No but they would not be as they are wirelessly connected to the primary AP so the others do not need cat to connect them back to the router/ switch

yes it will work with ISPs as you use your existing router, presume in your case super hub, you should disable the wireless on that though.

Good Call, in theory these are basically 3 AP's but just linked, I strongly recommend the Ubiquiti AP's for value for money, that side of things are easy just keep your existing router as the Edgerouter Lite is not point and click.