After a couple of days using them some thoughts; They are superbly built, heavy and really quite gorgeous in Rosewood. Fairly unobtrusive too. They are slightly smaller, slimmer than I expected. The bass mid unit has a cast frame, the tweeter looks like a conventional fabric or silk dome.
Sound is warm and punchy. The highs are smooth and detailed. What is interesting is the midrange. It is very clear shining through the warmth. This is especially noticeable when listening to metal and punk. It gives good drive to the music without fatigue. Bass is ok, controlled, fast and full but not especially deep. My guess is there is meaningful bass to perhaps 45 or 50hz. There are modern standmounts that go deeper but perhaps not with the coherence of the Missions? It quite literally is all seemless which makes me forget about the hardware. Soundstage width is not as wide as my Quad standmounts (or even the B&W's) but again, it's so nicely coherent that it hardly matters and after a few seconds I don't notice. Depth is good and approaching that of the Quads. Soundstage height is fine even though the tweeter is below the bass unit but is not quite as high as that of my Quads. I have an idea on how to change that. - Authority and solidity is very good for such a slim, small floor stander and better than the standmounts. It seems easy to drive and would possibly be a good choice for even fairly low powered Valve amplifiers. It also goes loud without 'shouting' or obvious compression with my 60w Hegel. I think they are rated to something like 108db/m absolute maximum, but I was listening to some White Stripes at what seemed almost realistic levels and felt the furniture vibrate. I normally listen at far lower levels though.
It's almost impossible to believe that so much good sound can be had for next to nothing. I can't imagine there are new budget speakers that would better these but I can't be sure.