I have an ancient Thomas Organ Crybaby that used to sound great, but has been played to death and would need some tender lovin' restoration to sound good again. Until then, I've effectively replaced it with a stock Dunlop Hendrix wah (what Zakk used before the signature model, and I think Tim plays one with Ozzmosis) which is, frankly, a perfectly good wah that doesn't cost the earth!
I've heard excellent things about the RMC3 from people who've played them, but frankly USD 285 is a hell of a lot to spend on a wah pedal. I could be tempted some day to get the Wizard Wah, though (which seems to be soft of the simpler, "budget" Teese wah).
But, yes, everyone needs a wah! :)