Well I've clocked about a dozen hours with this baby now and I'm seriously impressed.
2D picture quality is great. Colours were a bit off from the factory with green tinted grays and some over saturation. Since I'm using this exclusively with a computer, I did colour calibration with a Spyder3 and that fixed all issues. Guys, if you are using a HTPC INVEST IN COLOUR CALIBRATION. Even the best rated displays are often way way off in some areas.
Blacks are as good as any DLP in this price range. Shadow detail is better than I indicated above, where it was actually the source material that was at fault. Only the very darkest shadow detail is lost, and it depends heavily on your 'degamma' setting. The only complaint I still have regarding picture quality is that there is a noticeable rainbow effect for me with white on black backgrounds. Not enough to bother me personally, but it is there and it is occasionally noticeable.
Hardware wise, it's good looking, reasonably compact, and quiet. Nothing more to really comment on there. Wish it were black.
Software wise, I have some issues. It does not remember settings like 'eco mode' and resets them every time the signal changes or you switch some menu options. Very very annoying. I want it to stay in eco mode all the time.
I also had some issues getting it to work as I wanted with Nvidia 3D Vision. One problem is changing the refresh rate to 120hz (which is needed for 3D) drops the brightness of the image significantly. Therefore, I only want to use 120hz for 3D content.
The 3D profiles for the projector automatically force it to a 120hz refresh rate all of the time. I wanted it to automatically switch between 60hz and 120hz only when I load a 3D video or game. I eventually got this working, but I had to play with the Nvidia drivers and monitor settings lot more than I should have.
Nvidias drivers also automatically set the 3D depth for this projector very low, so the 3D image looks kind of squished, unless you are sitting very far away from the screen. I had to manually hack a setting in the windows registry to get good 3D depth.
Once it's all set up though, what a treat! 3D on this projector is AMAZING. No ghosting issues what-so-ever. Sitting a few feet away from a massive 3D screen while playing a game is more immersive than any virtual reality setup I've tried. When you start getting 3D objects popping-out in your peripheral vision you will lose all sense of reality. There is no feeling that the screen even exists, it is very very impressive. If you are buying this for 3D games, you will not regret it in any way what-so-ever.
The 3D effect in games is even more impressive than 3D movies because you can adjust for the correct depth no matter where you are sitting. With a video the depth is pre-determined, so if you are sitting closer to the screen everything looks a little squished or if you are sitting too far away everything looks stretched away from you.
To sum: Very little to no compromises for 2D (in the price range), AMAZING 3D (With Nvidias glasses. Can't say about others.) This little unit should be getting more attention than it has been. The one person to compare the Optima HD66 to the Acer side by side seems to suggest the Acer comes out on top, and it's cheaper if you shop around. I wish it were 1080p, but then it wouldn't have been anywhere near the $600 I got it for. Seems like a no brainer