802.11ac would be only good on a phone because routers now have ac if would basically mean "you need to upgrade your other devices just to use this other thing you don't really care about"
Its good we have it, but how many people will be seriously replacing their non-AC routers with AC routers just to use it part of their iPhone 6 ??
Not me.... if it works, why fix it? and when it breaks, well,, the market will judge that.. But i have i 5s, there is no reason i should get a 6 just for that alone, even if my 5s breaks, as long as i can still get one.