Audio Concepts in Houston has a 2.35:1 BD on display with an Epson Pro Cinema 810 720p projector. I don't know much about front projection, but it looked very good. It was in a batcave, but had 75W halogen track lights. The BD handled the bulbs 4 feet away fantastically - you had to shine them directly on the screen to wash out the image at all. The screen did wash out much easier when a bulb next to the projector at the back of the room was pointed at the screen. Their screen was supposed to be a 1.4 gain, but again white paper showed a much brighter image. However, I didn't have someone else hold it while I stepped back a few feet and made sure I was looking at the screen from a 0° angle. I called SI and they said they'd look into it, since their 1.4 screens are definitely brighter than paper. I saw no hotspotting or sparklies, but I'm also not extremely picky about the picture, I just don't want any significant artifacts. I would say it looks very similar to a direct-view LCD screen as far as its ambient light rejection and off-angle viewing. Way better than a rear projection set.
Note about Audio Concepts: I hate them. They were ignorant and rude. I had to convince them that there were 2 gains of BD, then they had to look at the receipt to find out for sure they had the 1.4. They had no idea how many lumens the projector put out, what mode it was running in, and acted like those were the dumbest questions they've ever been asked. They didn't know how big the screen was (maybe 7' wide was their estimate), and gave me a lecture about how diagonal sizes don't mean anything since we're not using 4:3 screens anymore (I just wanted to get an estimate of the 16:9 image they were projecting on their 2.35:1 screen). When I held up a piece of copy paper and saw it was quite a bit brighter than the screen, another salesman came by and told me that of course it looks brighter since it's a different material and "people with training" at the factory measured the screen and they know what they're doing. Sadly, I'll probably go back with my wife once more since they're the only place in town with one, but I obviously will not contribute any money to their hatred of clean-cut 30 year olds in scrubs (I guess my demographic is ruining the world or something).