OK, so I installed the speakers...
OK, so they're in. I'm not disappointed, but they do not sound as good as the sales guy claimed (of course). I wasn't expecting them to. (the poor performance is mainly in the soundstage and "openess". They sound like... in-ceiling speakers. Granted, the front speakers by design are angled to help provide a better soundstage, buts its not like an enclosed speaker at ear level (of course).
The install went cleanly (I'll post an install thread with pics). I wound up creating a semi-enclosure (bracing) using 3/4" board, silicone, dynamat, and batt insulation.