I got my Grip from Dealextreme,
and holy crap, the blue button (which you place your little finger on) is so goddam sore.
I think youll get carpel tunnel if you play it for more then 20 minutes a day, your little finger stars seizing up/cracking (im not even exaggerating by the way)
And I dont even have big hands.
If someone actually had big hands, it would be a 100x worse,
not to mention the grip keeps coming out if you have to move you move your hand alot.
Im kinda dissapointed , but I suppose you cant expect much for a 'guitar hero' version on a ds.