Thanks all. You've been very helpful.

I used to own the Digitech Vocalist Workstation EX. I found the main advantage of that was its 'on the fly' table top design slider controls. I have noticed a substantial improvement in harmony sound quality with my TC Helicon VoiceWorks unit & continue to be very happy with the results, both in the studio, and on stage. Is it worth the difference in expense? It's your call, but for me personally, yes it is. - Scott