I dont like the sound of it too much anyway tbh. I really don't want to rely on wi-fi to watch stuff I've recorded. I think I prefer having my own box with 2 tuners and 2TB internal hard drive. No issues at all. I can see quite a lot of issues rearing their head with Sky Q.
It's pretty clear why they're doing this though; having your TV shows/movies tied to one box attached to one TV is no longer compatible with how a growing number of people watch stuff.