IMO it's a pretty comfortable fit even with keyboard, but a PS2 controller performs even better than the GC controller in my honest opinion.
Well, I'm gonna get the GC one. I like to play games how they were intended. And I plan on getting more GC games, so I'll just stick with the normal controller. Maybe if I feel adventurous, and get that 3-in-one adapter that connects to GC, PS2 and XBOX controllers I might buy more different ones to experiment... But I need money for the Wii U right now.
And maybe with practice, it's
possible to play with the keyboard, but since I've never used a GC controller before and don't have a user manual, it means that I have to both remember the layout
and figure out the controls. Ouch.