I've used the autowah in the Zoom G5 and the GT-100. It is a really cool effect that is very much driven by pick attack. You can adjust the pick attack sensitivity.

As a fellow autowah user, I thought I'd chime in about how I've found it useful.

I find it useful when mimicing a solo on the guitar originally done on a horn...trumpet or sax.

It usually makes people smile when I use it and I'll use it for a bit of shock value. The initial reaction is "what is THAT!?!?". I use it for the solo in "Heard It Through the Grapevine" (the Gladys Knight version) and I've used it in blues jams just to present something different.

I use my regular wah very differently. Each has its place.

Good luck with it!