I went later and the issues they were having seemed to be resolved. One pair of glasses did suffer a flat battery later on, with on eye getting stuck in the 'off' position. That viewer (Rollon1980) had noticed flicker as well that I wasn't seeing. Though I then gave him 'my' glasses and he still saw it, so I think it's viewer dependant. I did suffer a headache afterwards though, so maybe it's subliminal with me.
I thought that the Christmas Carol film looked much better than the Samsung demo disc they had as it had noticable ghosting, so I guess it's also disc dependant. I did think that the 3D stuff was a little dim for my taste though (the lamp is at around 200 hours on this particular X7 FWIW).
Interesting that I didn't really feel the 2D side was a massive improvement over my recently calibrated HD350 plus VideoEQ. We watched in THX mode on both the X7 and the HD990. Needless to say there was a difference, but only that the HD990 looked redder and the X7 bluer. I couldn't say which was closer to correct as I'm not that refined a viewer. I thought that the brighter scenes had a decent amount of depth to them, but IIRC THX targets 2.2 gamma and I'm used to seeing 2.35 so it didn't seem much if any different to what I'm used to. The fade to blacks weren't as good because the HD990 was in hide mode when viewing the X7 which meant that there was the additional black level being projected over the top of the X7. They did turn off the HD990 later on, but I was starting to get a headache at that point so can't say of the blacks improved much. I also noticed that the shadow detail I've gained since my last calibration was missing from both the HD990 and X7 so perhaps they would benefit from a calibration as they'd only had a basic setup and used in THX mode.
What I did notice was that motion seemed smoother. This was despite the Arcam BluRay used for 2D having to be used in 1080/50p mode. It gave a frame jump due to the conversion, but motion otherwise seemed good. I now plan to home demo the Arcam with my HD350 to see if I get this improvement in my setup or whether it's more due to the projector. The 3D stuff was at 1080/24p from a budget Samsung player and seemed very smooth as well, so perhaps it's the projector though. We tried playing with the CMD settings at one point, but we weren't clear which was which, so turned it off again (I believe we later heard that it doesn't work at 1080p on this pre production model, but I may be wrong).
I'm glad I went (if only to meet fellow AV fans), but I also feel relieved that I'm not getting the urge to upgrade my HD350 unlike the last time I went and felt disapointed with the AE3000 I had at the time...perhaps we're starting to get to the point of much smaller incremental improvements, either that or I've reached my personal 'good enough' level and I'm not refined enough to appreciate the difference.