I have had great success with 3D on my DLA-X9 with 3D blue ray. Avatar was amazing, and the animated stuff like Shrek looked good as well, without ghosting.
3D TV via comcast is absolutely horrible though. I am not sure if it because of the side/side top/bottom way they send the signal, but it is pretty unwatchable. The difference between that and the blu ray movies is huge.
I am looking to get Yogi to check out the 3D, since I heard it was really good. But again, with blu ray movies, I think the 3D is really really good.
My setup is an elite screens 125" screen, with basically no gain (1.1). I mounted my projector almost as close to the screen as I could, giving myself maybe 10-20% from the limit of the zoom. My normal viewing distance is around 18', but I have stood 6 or 8 feet from the projector and the 3d looked just as good.
I am outputting to the projector from my PC using PowerDVD 10 and Sandy bridge graphics (HD3000) at 24P(FP) though and Onkyo tx-nr809.