If you're into pitch shifting, filtering, delays and stuff like that, look nu further. Not cheap, but worth every penny. I love that you can edit it from your phone or iPad, store presets, etc.
You can create any effect from basic pitch to totally over the top (fat synth sounds are also possible), I use it on bass and it that works great as well and sounds better than all other shifters I ever had.
The software is easy to use, and they thought of everything. (you can connect up to 3 pedals switches, you can limit your preset range to avoid on stage confusion, the hot knob and xyzzy knobs are great, etc.)
Too much to mention, you have to read the manual to enjoy this processor to the max!