I don't have the Vater
sticks specifically, but I've got a set of Vic Firth
"Alex Acuña" model (same basic idea), and some old, thicker-than-usual LP
timbale sticks. I'll use 'em occasionally if I'm doing more "percussion-oriented" playing, particularly when I'm not riding on cymbals. I like having the sound/feel of this kind of stick, especially on cowbells, without having to flip my sticks around. The only think I've found lacking is, oddly enough, cross-sticks (or "side sticking," whatever the accepted term is around here) - they sound kind of thin for my tastes compared to a conventionally-shaped stick.
Also, there are the old Hinger "Touch-Tone" aluminum sticks that were the same shape as the Vaters
being discussed here - they were designed for orchestral snare drum work. Interesting sticks, and they sounded and felt pretty good for that purpose, IIRC - altho I'd never use them for general drum set work.