Yes, I've tried the HE-400, HE-500, and the HE-6. I prefer the LCD-2/3 for comfort due to the much nicer headband and ear pads. I've heard some people gripe about the clamping pressure on the LCD's, but I wouldn't want mine any looser. The HiFiMANs put more pressure on the crown of the head--I may be more sensitive to that. I'm looking forward to the build updates see what they change.
I do recall remembering you selling it off and yes it is fairly limited with the crowd of headphones that it can drive (say big no to sensitive and low impedence can's), now that you've mentioned it did you enjoy your VI+ back when you had it in your possession?
+1 on the WA22 bit, I honestly don't find the WA22 even attractive sound and price wise compared to the VI+, the looks maybe but I could not tell a single time where the WA22 I listened to sounded better than my VI+.
MVKI is a great amp for it's intended headphone group (K1000 + 300ohm headphones). The price just makes it silly to choose the WA22 over it. Wish I still had mine now that I'm back into full size headphones. Only sold it because I thought I would stay in IEM land for longer.
Rosewood is WOOD guys. Unless Audeze starts only buying grade A stuff there will be some variance. My new pair... butt tons of 'character', no even grain or colour anywhere on it. Ranges from white to black, wide soft grain to hard narrow grain. But then I bought mine for ... sound :O
I've only heard that combination once at a meet right after HD800s came out. At the time I didn't think much of the HD800 on any rig. The MKVI was great with my HD600, though. Would be interesting to hear the MKVI again now that I enjoy the HD800.