I use it in my 9.2 system for parties and when I'm just puttering around in my great room, but not for what most would call "critical listening". I'm working on a dedicated music only two channel sysyem that will be located in my office after we finish redecorating it next spring. A pair of Audio Note AN-E's in one of their various incarnations and SET amplification is on the agenda, but that's a subject for an entirely new thread when I'm up and running.
I'm glad that Integra included an All Channel Stereo mode in my AVR. At first I didn't think that I would like it, but circumstances made me reconsider. I mostly listen to rock and pop music when I use this listening mode and, quite frankly, who the hell knows just what the recording or mixing engineer intended for it to sound like to begin with?