I've just bought one and man does it sound bad, harsh, tinny, brittle, all those sort of words. Every single patch has that sort of nasty, scratchy, modeled, digital sound to it, everything is just harsh variations on that one single theme. I'm plugging it into a MOTU 828 mk3 and then through some monitor speakers. I have an ancient digitech gsp2101 which sounds lovely on high gain sounds so I took the line outs of the Helix and put it though the cab emulations on the 2101 and what a difference! I'm going to make some impulse responses from the 2101 and I will post the fruits of my labours as soon as I get it done.