I agree that it's unnecessary. This does less for me than the original did (thanks to being WAY overplayed in my youth).
Well, produced, decent enough playing and singing, but Blah!
As for Vai, I've been a HUGE fan since his Zappa days. I will do everything in my power to see him live whenever I can, but on cd, he hasn't done much for me since Fire Garden, and that was what 1996, I think. I really wish he'd get that hunger back that he had in the 80's & earlier 90's. There wasn't a guitar player on the planet who could touch him back then. IMHFO, of course....