I wanted to upgrade from a Carl Martin 2-Wah that I had been using originally. I googled top Wah pedals and the Xotic came up. This is a serious pedal! First of all, it's smaller than other wah pedals, making it a great fit on my Palmer Pedalbay board. Being able to adjust the parameters of the wah on the outside with the four controls is handy, but you can also open up the pedal to add more character to your sound with the tic-switches (not the technical term).
I use this on a cello, using a DPA 4099 as well as the Schertler Stat-C pickup, both going into a Schertler Yellow Blender. The sound is phenomenal coming out of this machine. You can get a skanky sound out of it right out of the box.
I don't think that I've had a pedal that I have liked so much before. For me, the only drawback with this pedal is that it's white!