Surprised he didn't go last summer when Man Utd were reportedly very interested. Probably would've got more for him then.
He has a lot of talent - and I mean a lot - but simply hasn't developed as he should have - admittedly he's had very bad luck with injuries. Hope he realises his potential but again, but surprised he's gone to Man City.
Have a feeling the fee won't be absolutely massive (as it might have been last year), as although they have stupid amounts of money, they'll be smart enough to know a) he has injury problems and b) we could really do with the money. At a guess, I'd say a little under £15m.
All in all it should be a good deal for us, providing Moyes sees it.
Edit: 1878 makes a good point about his mentality. I know he's young but considering the natural talent he has, he's bizarrely afraid of making his mark on games and really dominating him - he has the ability to do so.