10 million is too much. I'd buy him for around 5-7 million. Anything around that price is a good move.
He's a very unique player. No English player can pass like him. Not Gerrard, Lampard or Beckham. None of them even come close. He can pass short and long, crossfield and can see a through ball. He reminds me of a bigger version Scholes.
Technically he's very good. Good touch, gets the ball out of his feet and makes the pass. If he's on form and fully fit he has the ability to run a game and be a very effective player.
Fitness and lack of mobility are his only problems. Fitness can be sorted whereas his role and style isn't really about mobility. Pirlo isn't mobile, Carrick isn't mobile and neither is Scholes. All deep lying players need are passing ability, vision, intelligence and the ability to retain possession. He has all the attributes mentioned.
His sheer height and build would also be useful. I think we need a deep lying play maker if we are going to move up that next level. Somone who drops deep, demands the ball and makes the passes. Every top team has one and its needed. A player who can Link defense to attack would cut out the hoofing.