3D is really cool depending on what you watch it with.
My 47 inch 3D TV I picked up for 800$ a month back.
It works great with things that are meant for 3D. (3D blu-rays, 3D Tv shows) I especially enjoyed watching a program about the deep sea in 3D. It was so good that I could literally reach out and put my finger in a fishs mouth.
However, the screens edges get a little bit iffy. The 3D will get a little bit fuzzy around the edges of the screen, and wont work great.
My TV also has 2D - 3D conversion settings, and they work , but barely at all. I can play my Xbox 360 games, and then click the 2D-3D conversion button, and the only thing that looks 3D is text that appears on the bottom of the screen, and sometimes my cursor for my weapon. Perhaps its just my eyes being hopeful though...
Anyway, for an 800$ 47 inch 3D smart TV, I think its pretty good. However it isn't wonderful.
This is why I am voting for "Yes I own a 3d TV and they're good"