Steve Vai, Joe Satriani, and to a certain extent Jeff Beck, all walk a fine line with their talent.
They have a tendency to show off their talent (which is prodigous) rather than play songs which are listenable or musical. This was a good cut from Steve Vai. I enjoyed the complexity of the song. He mixed it up pretty good.
(Editors Note : no flashy guitar player was injured or defamed in the expression of this opinion)
Here's another example of Joe Satriani. When he wants to, like Steve Vai, he can play the s-h-i-t out that guitar and still be musical.
JOE SATRIANI. SURFIN WITH THE ALIEN. 1987
Why yes, you need as much volume as you can muster. 11 seems about right on my system