I just purchased the new Electro Harmonix Voice Box. I was expecting a 50-50 shot at liking it in a rock band situation, but our first rehearsal with it went well. When the band is playing, **** if it doesn't sound like you just added another vocalist to the band that hits the harmonies as good as you hit your note. Lots of options to choose which harmony you want and how much you wanted blended in to the mix, reverb, even make it sound more male or female. I think this thing's a keeper. Didn't have any issues with bleed through on other mic's or instruments in the band, sounds pretty natural, and although it says it relies on the your guitar (or other instrument) to set the key so to speak, seemed to work just acapella too. Weird. What it doesn't really like is your voice slowly traveling from one note to the next - you have to be on your note and hit it.