I have a 50" Samsung DLP. I love it, although I had to get most of it replaced.
First, I noticed that the convergence/pincushion was bowed out quite a bit. All of the nonCRT rear projections can have this issue, but since there is no convergence control on DLP TVs, nothing I could do about it other than get the screen replaced. I finally got them to replace the screen because there were drip marks where it was treated with some type of liquid. Then the engine went out, and they had to replace that as well.
Really, the only thing that is still on the TV as I bought it is the chassis and the AV inputs. Good thing is, was all free to me, 1 year warranty covered all of it. I didn't get the extended warranty when I bought it, but I would suggest it for most TVs.
Good things about DLP, no burn-in, all you have to do to make it just as vibrant as it was, replace the bulb! Very light and "compact".
Good things about CRT, convergence control, no bulb. Cheap.
Bad things about DLP, gotta replace the bulb, no convergence control.
Bad things about CRT, heavy, big. The phosphurs on the screen will age over time and everything will color shift to the red. You can use the color controls for awhile to counteract this. Worst thing is, if you use letterboxed 4:3 mode for standard def TV (I do, can't stand stretched images) the screen will age unevenly, leading to lines on the picture where the black parts and image in 4:3 mode would be.
Anyways, I can't say anything much about LCD or plasma TVs, never owned one. Hope this helps.