I used him in a 4321 as my left CM.He is one of the best box to box CMs for that money in my opinion.He also better than Vidal in my opinion.If you have got Alaba and Boateng use Tolisso as your CM not Vidal.
-has a great goal threat
-insane long shots
-good passing,dribbling,Defendig and Phy
-Wins most headers
-he is everywhere on the pitch
-His pace is a problem sometimes because he has very low sprint speed
-3*,3* are ok but at least 4* WF would be better