Feelings on Mata. Class player, would be awesome for any team in the world.
Worth 40 to 30 Million? No not for me. However, if Fellaini is worth 27mil, then Mata is worth the 40mil 100%. Prices these days are crazy.
Mata right for United? I'm not sure. Here's why IMO.
His best position is behind the striker, same with Kagawa. There the same player pretty much. United don't play a system that get's the best out of these players. We play two up top, two wide. That's always been United's best strength. That's United in a nutshell.
Rooney and Persie are United best players, both have to play, both are better then Mata so will a formation change happen? Will all three play in the same team? I'm not sure. However, if not, then it's not worth buying him. If we are going to buy Mata, we have to change our system and formation. something like:
Rafael. Vidic. Evans. Evra.
Cleverley. Carrick. Fletcher.
If we played this, it would allow us to play two strikers along with Mata, but it would mean sacrificing our wing play (Which has not been great anyways.) and would mean we would need to play narrow, putting pressure on Mata to be the major creative force. Also another option would be to drop Rooney behind and play this formation with Persie up top, while Rooney & Mata play in behind. Switching and rotating. That could be an option that would support Mata in this team.
So final conclusion, would it work? If the formation is changed. I can't see Mata playing and being forced out on the wing for 40/30mil, that would just be silly. Do I want him? We need the lift it would bring, quality players are hard to come buy and he's shown he can do it, he's the player who needs an arm round him to let him know he's doing well. Major downside it would mean that would be the end of Kagawa I would assume.