I've been contemplating the purchase of a T.C. Helicon vocal processor (Harmony-G XT or the VoiceLive Play GTX). The main use is for solo open stage type performances...get some better vocal reverb, occasional doubling and some harmonies for tunes. Has anyone had experience with these tools or others? Most of the demo's are pretty straight performances that are meant to showcase the effects and don't do justice to the character or emotion of the song itself.