I snagged a "retail" copy of Vista @ Best Buy shortly after its release (I have a Bill Gates signed/numbered copy lolol) and installed it in dual-boot with XP.
Aside from an otherwise perfectly good AGFA flatbed scanner inexplicably not being supported in 64-bit I really had very few problems with Vista even right off the bat. EXCEPT it was slow as molasses compared to XP especially in games. As drivers improved that became far less of an issue.
The reason I actually DO prefer the user-interface in Vista is that M$ had yet to go down the "multiple-levels of menu clicking" to reach commonly used utilities.
In Win 7 MANY items that were 1-2 clicks from the desktop in Vista became 3-5 clicks/menus deep for no good reason, then in 10 MANY of those same items went to 6-7 clicks down ... -OR- just moved. (apparently at random)