don't know about the L-550 AII, but I got the L-550 AX a few weeks ago. I moved from EAR 868 / CJ Premier 140 combo to this integrated and haven't looked back. My circumstances may be different than yours, but I like to leave my equipment on much of the time and solid state (class A) fits my lifestyle better than tubes. The Luxman is solid as a rock, oozes class, the loudness control is nice and the phono stage sounds great. Very musical sounding unit. The soundstage might not be quite as deep as the EAR/CJ combo, but I do think the overall sound is at least as nice, and somewhat more fleshed out to my ears.. The 20 watts are just fine with my Gallo Ref 3.5 speakers. Let me know what else I can tell you.
Steve