Just to clarify (I'm not sure which type of flat TV you were looking at), but tube (CRT) TVs can be flat or curved (just because it's flat doesn't mean it's not a tube TV in other words). Other than the authenticity benefit with curved screens, one problem I've found with the flat screen tube TVs is that they seem to suffer a little more from geometry problems (distortions on extreme edges, pincushion, etc). This makes sense if you consider that there is slightly more distance from the electron gun to the outer edge of the screen on a flat TV.