I am typing on mine now, so far I love it, I had some problems (as others have had) with an ATI AIW 9700 pro in mine, seems a problem with the circuitry in the mobo, some of them work some don't. Other than that its been working great for me. I have a GeForce FX 5600 256mb card in it now w/ 1gb PC3200, P4 2.4c, 120gb SATA HD, and a TV Tuner card and its working great.
Heat isn't bad and compared to my old systems its pretty quiet. They come with a 200w power supply, they made a new enhance power supply that took care of the old power issues and is quieter.
Overall I would reccomend it.
-Matt