I like it, but i think its an unusual module in that its really not the others..its an Original Randall sound. I recall that Randall said so a few years ago..
Anyway its very high gain, very smooth and probbaly best for soloing for many (maybe most) guitarists.
I can see the Santana reference..but he really doesnt sound like an Ultra..he is,however, just as much distortion.
I think Vai is a better description, like his soloing in Whitesnake years ago.
Its a cool module. I think it has a compressed dynamic range..but many will like that (if they notice it at all) for soloing.