I've really been enjoying mine. Of course, I'm still waiting for the two-day programming guide, and I've noticed the picture is a little on the dark side, but nothing horrendous. The biggest improvement for me, though, is scrolling speed. I swear all the time I spent scrolling through the program guide on the 6000, if you added it up it'd be a year! Oh, and there's no fan noise either. Aaaaaah.
I'm not 100% happy, though. There's the lack of the two-day programming guide, and I have had one hard lockup -- wouldn't even power on -- and had to unplug it. I don't watch locals much, though, so I don't have a big problem with the channel reassignment bug, though it would be nice if that would get patched soon.
All in all, I'm happy with it, and with the expected bug fixes it should only get better.