I've never used the new one (in fact, until I read this thread I didn't know there was
a new one...but I'll be damned: http://www.ehx.com/products/talking-pedal
) but fwiw I've got one of the original
circa 1980 Electro-Harmonix Talking Pedals
which is also
a "vocal formant wah with fuzz"
...and it is killer
on electric bass! In fact, I think it sounds better on bass than it does on guitar.
Sounds unlike anything else out there, doesn't suck low end, really cuts through a band, devestatingly cool sounding stompbox.
If the new one is anything like the original it's a must-have imho.