We bought a 3D tv last year. I've yet to be blown away and I now think it's pretty much dead technology.
My lovefilm subscription has given me the chance to watch quite a few 3D films and there is just no point. We had a Samsung active set and returned it for an LG passive. It's much better but the content just isn't there.
99% are artificially converted to 3D, and there's about five or six now I think which have been shot in 3D. Those aren't brilliant either.
Not once have I thought 'I'm so glad we watched the 3D version'. In fact, one of the films we have to watch is Hugo and I actually think I'm going to put the 2D version on instead. This is supposed to be one of the better 3D films, but after watching a few minutes of it it's just like all the others.
I think I actually know what the problem is, and it's not all to do with the technology. If I pick a scene in a 3D film and pause it for a good few seconds it pops out LOADS more and looks really great. The issue I believe it with the human brain. It takes a while to adjust and because the film is running so quickly our brains can't keep up meaning the effect isn't going to be great. You just have to look at the shop demos. Most of the good scenes are slow moving like the pillow feathers. That does look good, but it's slow moving.
If we were buying again we would still go for the same model as it is a really great 2D set. I think most of the good higher end models are 3D anyway even if you don't want 3D.
Like most of the people in this thread, prefer higher frame rates.