Don't know about Diamondtron flat, but it is flat like any other flat tv. One thing I think why it is cheaper than other models is because it only has one s-video input and 2 composite video input (back & front). That means if you want to plug in the dvd/vcr/game console directly to your tv, then you don't have enough inputs. No video out, so if you want record anything, then forget it. (Actually you can if you feed your video sources through the vcr/dvd-r first.) It doesn't have much functions or options, very basic. I got one for the bedroom set because I don't need that much functionalities or options.