I've used the mixer for several years now. It is small, lightweight and loaded with features. I prefer the "old" knobs and sliders rather than the layers of screens, but no big deal. However I haven't had any success the couple of times I tried the room analyzer, but then I don't feel my Bose Compacts need much, if any, e.q. to sound great. I probably didn't do the analyzer right, but it made the sound nasal and too bright in the upper mids.
I don't know what Fran does to his, but nothing is missing frequency-wise on mine. I'll bet I've "sold" a dozen sets for Bose from people hearing them and thinking they have to have 'em!
DonM