Thanks to all who responded. I bought the Helix, and after playing with it for a while I have come to the conclusion that almost every sound it makes is colored by the sound of the Mesa, or more likely, the 4x10 Marshall celestion speaker cabinet the Mesa is running through. That is not necessarily bad, but as others have said it does not allow you to experience the Helix at its full potential. So, its now time to research FRFR systems. Back to Google and Youtube because Guitar Center and Sam Ash are worthless. It's always best to hear things in person but as you know going to those music stores is a horrible experience these days. If anyone has any thoughts about the Line 6 Powercab 112 Plus let me know, otherwise I'm sure I will find plenty of opinions about FRFR on other forum postings.