Quote from =Prime Killer=:
The GC controls are the best so far-you don't have to squeeze your hands to press a button. X-Box is too thick,too many buttons smashed together and they go together like string beans and vannila ice cream. Just won't work,but if you have big hands,they are the best. I have medium-small hands. So GC and N64 work for me. I don't have the button-smashing games,but Hydro Thunder did the trick. 
Yes, i think it is too thick as well. The buttons are verry round and stick far out. Me says that hurts sometimes when you press on them hard.