TT, haven't played with it that much yet, but I can tell you this PC flys like the wind... I went from USB 1.0 cable connection to ethernet connection and it made a huge difference.
I just got it and set it up yesterday. I havent messed with the Media Center yet. I do not have a TV very close to my computer so I need to find the right extension cords to set this crap up. Hopefully someone posts something about it so I know if it is worth hooking up to my cable.
I watch TV in a small window on my second monitor. I record those old movies that run at 4:00 am then burn them onto DVDs after editing out the commercials. It's the nuts!