I remember the predecessor to the Flexwave series being pretty good. Tidalwave I think it was called. Like the Shockwave, I think some of the circuitry was the same as the Ampeg VH-140. I don't know if that actually carried over to the Felxwave though.
Crate put out some real stinkers; angry can of hornets anyone? They did have some pretty good sounding ones too. Stealth, Blue Voodoo 150 & 300, Shockwave Vintage Club and Palomino come to mind.