yes, Vai is modest.. he does have a bit of an ego, but you do have to keep a distance from the usual run of the mill fanboy. when i had that interview with him, it was a LOT of fun and chit chatting afterwards. shame we didnt have more time, cos it was a really small group (3 guys) he'd let us play through his rig.
anyway. i LOVE that demonstration and how he takes the piss out of himself. there was also one, where he explains the stuff he uses on stage and he pointed to the fan and said that is the biggest most important piece of kit that he has on the stage hehe