Been meaning to get one of these for a while now, I used to borrow one from the lead singer in my old band. I mailed her the other day and she was willing to part with hers since she doesn't use it anymore.
TC-Helicon VoiceTone Harmony-G XT
The effects are really excellent, and add some real life to my very average vocals. ?
This particular version also allows you to plug your guitar into it (and then out into your board or amp) and the pedal uses the chords that you're playing to create the harmony voices. That way, you can sing a different harmony line while the voices will follow what your guitar is doing. Just don't play the wrong chord because it can sound pretty awful. ?
Quite useful if you want to be more in control of the effects on your voice, especially if you want different effects for different songs.