No, not gonna practice. A/B'd it to my current filter, and I like it better. For an effect that gets so little use comparatively, I'm not gonna spend hours and hours on it when I can get something that can do it for me. I'd rather spend the time practicing riffs etc. I guess it's the same basic principle, but I just don't feel like learning a wah I suppose. When I do use the envelope filter, I use it A LOT. And I'd suck at doing that live, so EF it is.
Invite back one of the keyboardist a who couldn't really play to be your wah man/Treadle monkey.