I've been running the Windows 7 beta and now the RC since it was first released (posting from it now).
I had no choice but to use Vista on my new computer. As I have 16 GB of RAM, and XP x64 (standard XP can only see about 3.2 GB of RAM) is waaayyy worse than Vista with compatibility of software and hardware.
That said, the Windows 7 beta is what Vista should have been, and the RC is actually very nice. Of course I'm running it on a computer with 16 GB of RAM, a 512 MB video card, and two and a quarter terabytes of storage which is spread across four, 15k RPM, Serial Attached SCSI, hard drives. If you have less than that, your experience may be scaled in proportion.
