Well I use the Harmony G XT and I really really love it. I saw a guy performing with the Boss and I didn't like the way the harmonies sounded . Not quite as natural. He was using the Boss VE-20 as a looper for his guitar and that was kind of cool.
So my thought is if vocals are what you primarily want go with the Harmony G XT , if you want looping and decent vocals maybe go with the Boss.
Finally , a vocal harmonizer is not natural to begin with so my thought is that to pull it off live it is important to get the best one you can. I love mine but I have thought of upgrading at some point to the next model up. The Voicelive 2 is awesome but 3 times more money.
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Paul
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