Yes, I do see rainbows.
They're not too bad, i notice them in scenes that have white on a full black screen. The biggest offender is the credits scene at the end of movies. Part of the reason I see them though may be because i'm projecting the screen bigger than i should. I'm projecting a 90 inch image and sitting about 8 feet away, my eyes can't take it all in at once.
There is no input lag.
I played many games including mlb the show 2011(which needs perfect timing to hit) and had no problem playing. I also played madden, dead island and killzone 3, and a bunch of the 3d demos on psn, and there wasn't any lag at all.
Projecting a 90 inch image onto a (slightly) off white wall, and sitting about 8-11 feet away. I'll probably make the projection a little small down the line, but right now i'm loving the huge screen.
3D is awesome on this thing.
watching 3d movies is incredible on this thing. I'm using the optoma dlp link glasses and the 3d effects are really good. Pop out and depth is going to depend on the content, but when its a good source you'll be amazed. I downloaded Resident Evil Afterlife from the psn and was blown away by the 3d(the movie sucked though). I didn't enjoy the 3d games as much though. I played The Show and Killzone 3 in 3d, and while cool, i didn't feel it added anything to the game. This isn't a knock on the projector, the 3d effect is very evident and cool, it just didn't add anything to the game.