I was fortunate to play through the 2x10 combo yesterday and was impressed. With the Semi Parametric EQ bypassed the sound was smooth and tube-y with a nice weight to each note. The compression was smooth as well, even at extreme settings. It didn't exhibit the "seasick" sound or pumping I've experinced with footpedal compressors. Overall I was really impressed. Makes me want to try the 400+, though they're hard to find in my area. On a somewhat related note last weekend I played an outdoor festival. The backline rig was a GK head into a Mesa cab with a 1x15" surrounded by 4X10" drivers. The setup sounded full and projected well, which was good because the PA didn't have any subs.