Really quite good
I've been using it on 2 machines, one an HTPC the other a work machine since the RTM some time ago. TBH I've had little to no issues, couple of BSODs which I tied down to a bad memory stick.
Just installed UBUNTU 9.10 on the work machine in dual boot ith W7 and they live together very well, in the past whenever I tried this the GRUB usually ended up screwing the W7 boot or screwing the UBUNU one, this time the W7 partition is chainloaded perfectly from the UBUNTU GRUB. I have had a couple of driver issues on the work machine I have yt to find a working 64bit driver for a Toshiba 453 printer/copier, the vista 64 one doesn't cut it.
The HTPC machine has a tuner card, firefly RF remote control, Quad Core 6600 with 4GB DDR2. It has to run 4GB of RAM due to the limitations of the Hauppage Dual tuner, pah!, but no other issues found, this machine is on 24/7 and only reboots when updates require it. During installation the installer detected the cheapo SATA RAID card I use (Rosewill 209) but didn't install drivers, following the final reboot into windows a quick visit to windows update donloaded and installed the required drivers. The 4 drives which were actually 2 XP spanned volumes were immediately picked up and correctly mounted.
Overall impressed, UAC lasted about 5 minutes until I figured out how to disable it!