I don't think he will add much to the squad imho. He is not a United player imo and for the amount they want for him is just stupid. Yes he adds aerial ability, however will he unlock a defense? Doubtful. Our trouble so far has been beating the top class defences and didn't have much of a look in for either the chelsea or liverpool game. Possession was in favour, play was in favour and yet we still couldn't score.
For a start, he will add lot of stability to the midfield.
Carrick - Fellaini >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Carrick - Cleverely/Anderson.
Fellaini is better at tackling, passing, winning aerial duels, physical presence, not afraid to go for tackles. Miles better than all our Cms bar Carrick.