I've tried most of what's out there. Wah is perhaps my all-time favorite and most important type of effect. The only one I've ever really liked is the Area 51, from Dan Albrecht in Michigan. I've used Dunlop (various models, including the 535Q), Fulltone, Teese, Budda, Vox, Keeley Mello Wah (modded Vox), etc., etc. ...
and was never happy, least of all with the Keeley.
After growing extremely frustrated, I tried Area 51, as he has a money-back guarantee. I paid for the extra tweaking options, too. All told, it was about $300, comparable to what you'd pay for a Teese RMC3. It's the best wah pedal I've ever played up to this point, hands down, by a mile. There are still things about it that don't totally do it for me, but I guess I've given up trying to find a wah that will sound like what's in my head. I could be crazy, you know.
Of all I've tried, the Area 51 is easily the best-sounding, and most well-behaved with different pickups, etc.
I think it could very well be "the wah" for many people. I just think a lot of folks don't know about Dan's stuff yet. I'd recommend it without reservation.
I hear many wonderful things about Scotty's ProAnalog Supa Quack ... never heard one in person or played through one, though.
If anybody wants to give Dan a try, he's a super nice guy and very helpful. Check him out at
http://www.area51tubeaudiodesigns.com. Also, feel free to PM me if you have any specific questions about it. Always happy to help my fellow BJF Fan Club Members, LOL.
Cheers,
Doc