I downloaded him specifically for the hat, and, well, it's not that good...
The hat is cool, I mean, and it leaves him looking the way I wanted him to be, but I'm leaving only two stars because the mod doesn't give what it promises.
Yes, the jump height IS increased and Knux now CAN break the breakable floors, but the ironic part is that it can't break WALLS that, theoretically, only Amy and Knuckles can. So, he can follow all possible paths in a level... except Knuckles'. That doesn't make sense.
And as you said, the super form is worse than the vanilla one now.