It is the devil's tool. I HATE it. The sound is all fuzzified so that the worst excesses aren't too painful - but that means that good singers sound crap. SO the bad singers make twats of themselves, the good singers make twats of themselves. My little soul cries out "don't do it", as the legions step up to the cringe-athon.
WHY would ANYONE want to do it? euchghghg-hawk-spit.