I haven't tried them in stereo modes yet. I just got my 990 yesterday. It is a huge jump in sound quality over the 5660 from yamaha I was running. I can hear many more things in movie soundtracks that I could not before. My only complaint would be the tonal controls.
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Family room
Outlaw 990/7125
Klipsch RF-25's, Klipsch RC-25, Klipsch RS-25, Klipsch RS-52's

Home theater
990/7125 - Until the 978 is released
Seymour Av xd 120" screen
panasonic pt-ae7000u
3 In cabinet Axiom M80's, 4 Qs8's, In cabinet EP-800 subwoofer