I haven't used it for much. The streaming works alright, but it adds a noticeable amount of input lag to games. The store would be useful if it actually had xbox one games in it, but instead it just takes you to the mobile games section of the regular windows store. I have no desire to chat with people I'm not actually gaming with, so that's out. Really not that useful when you get down to it.
Not getting input lag here, but in Forza 6 even with very high settings I get a lot of pixelation but in other games like PES 2016 it plays as if I'm playing right from the console itself, no lag nor video quality degrading.