I briefly used a vista laptop last friday.
The laptop had 512Mb ram, yet vista felt very slow… almost sluggish.
After some work trying to get it to connect to a wireless network, I eventually realised it was running on battery power. A quick flick of the power switch, and vista perked up.
Overall, once you look under the covers… past the annoying eye candy, its still very similar to XP.
I can now see why MS made ie7 so difficult to configure (and annoying to use)… so that it would fit into the vista look and feel 🙁
Yes, the extra security is great, it looks prettier, the nuts and bolts at the very lowest levels are probably completely different, but from what I saw, I can’t say I’ll be in a hurry to get it.