I don't know about others, but for me, the wider shape of the Head grip provides a better sense of orientation of the racquet face and increases the torsional stability of any shot that is struck off-center (which is pretty much every shot, unless you hit dead center, flat with no spin). I am just conjecturing, but I think that some people dislike the shape because they feel it hinders them from changing grips or from whipping the racquet. Someone who likes the Wilson grip better can chime in on this. I was a Wilson user for 15 years, but really loved the Head shape once I tried it. It all comes down to personal preference. It's a polarizing subject and there are many threads on this (much to many).