I just got mine set up and I haven't heard any strange buzzing or had any geometry issues.
I think it's important to know what your getting into, in order to set your expectations appropriately.
My new theater room is a bit smaller than the last, so I went with a 106" screen with a 1.3 gain. With dark carpet walls and ceiling, out of the box I saw exactly what I expected. Great dark detail, skin tones, best 3D I've ever seen, and not the best absolute blacks. But with good shadow detail, the image is still quite pleasant despite the less than inky blacks. You just have to know this going in.
I replaced an old Sony VPL-VW50 and I think it was a pretty good upgrade.
I do have one complaint tho. I think the Iris is crap. I've tried all 3 modes and it seems that the Iris is very aggressive and "pops" during any major seen change. I just turned it off and it seems to have remedied the issue. Any suggestions on this issue would be appreciated. The iris on the Sony was much better and far more subtle.
Now the 3D. Wow. I'm not seeing ghosting so far and because I have a dungeon it looks quite bright. I compare this to any number of local Cinema DLP screens. It is simply superior. A friend of mine has one of the new JVC models (can't remember which one) and I watched 3D on it. And while the JVC has better absolute blacks, the Mitsu just blows the 3D out of the water hands down. Well I was originally going to go with a JVC, but now having compared the two, I can live with some lighter blacks on the Mitsu. This is of course assuming you really want great 3D. JVC is certainly the better 2D unit as is expected.
If I try hard enough, I can make a rainbow show up, but in normal viewing, it is not an issue.
The clarity is thing thing in 3D I can't get over. I use the polarized glasses at the theater, and although they are comfortable, I see a lot of ghosting. Some may complain about the Mitsu glasses, but the quality of the 3D they give amazes me.
I would like to know how to access a hidden diagnostics menu or something to dial back the FRC in 3D mode a bit as it can not always keep up and it's a bit distracting.