The only reason I bought the TC voiceworks is because it is a complete vocal channel with effects,vocal doubling,pitch correction, dynamics,eq + the harmonies. I used to have the digitech, I forget the model but it was the first one they came out with about 10 years ago, and I have to say that was quite a Machine I loved it. When I bought the voiceworks I was torn between a Digitech and the TC helicon, it did cost me about$650 but to me the big advantage is, along with my mic and the voiceworks I bring my sound to any system I plug into.
And the harmonies and midi implementation aren't bad either.

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