I have not, but I'm looking forward to the review. I'm expecting the difference to mostly boil down to the Tube pre vs. SS, and the tonal differences suiting the player. I think output will be very close, but I'll stretch my predictions and give a slight nod to the 6.0 just b/c of the stringent rating standards used by Genz. I don't think there will be enough volume differences either way for it to matter, although voicing my provide an edge for one over the other in given situations.
I think for me, it will be all about the lows. I hear the Genz
amps don't always have enough in the lows, but if there's
some beef around 50-60hz, I'll be spending some money.