I like him, not sure just how good he is or potential wise if he can be a truly top player. My thing with the players in your most creative/attacking positions like where he plays, usually includes the #10 and striker, is that they really need to be top, top players if you want to be a top team. You can have players who punch above their weight in some positions and you can "make do" with them for the system, but if you use a creative midfielder/advanced playmaker type, then they probably want them to be truly world class (or close to it) and not simply "good" players. So that'd be my reservation for Maddison, though I havent paid enough attention to really say whether he can reach that really high level or not.