I bought the Optoma EH501 and have been using it for a few weeks.
It did not install exactly as I had hoped. The lens shift option does not allow for straight on projection. It just corrects a little bit. Still better than nothing. I did have to scale down image size a bit due to projecter placement issues.
2D on a 16' screen-- Looks great in a dark theatre. Had about 30 people over to watch Endors Game and it got a huge ovation in spite of being a lame movie.
I am just starting to have a critical eye but the EH501 looks great to me. Black levels, skin tones, and film like smoothness (not looking like masterpiece theatre) are some things I have tried to look for and I have been very satisfied.
3D on a 16' screen-- looks great with animated material (Wreck it Ralph, Dispicable me2, ect, ) and also great with stuff filmed for IMAX 3D like Great Reefs, and Hubble 3D.
I am not as happy with the live action 3D material I have watched so far (Man of Steel, Avatar, Star Trek:Edge of Darkness) There is a noticeable judder sometimes during action sequences and subtitles of stardates and places were so annoying it ruined the whole movie for me. Some of these problems could have been from my glasses. So far I have 18 pairs and about 4 different brands. Still trying to figure out which are best.
Overall I like it with the jury still out on live action 3d.