My initial impression was that I liked the new look and feel. You simply get tired of looking at the same stuff over and over, even with changing backgrounds and themes, XP's GUI was getting a bit stale for me. So I like the new UI, and LOVE that it runs using the GPU and not the CPU. I feel it is more responsive in many ways than XP's UI b/c of this.
Then there is UAC. I don't know where to begin. This has to be the most annoying feature ever implemented. I give them credit for trying to make things secure, but UAC is so verbose that it pretty much defeats its own purpose because I'd guess probably 60% of all users are going to disable it within a day or two. I've noticed it is the source of a few of my software conflicts too.
Well I'm going to just summarize what I think real quick. I don't need to be told that MS made Vista its own product and not an XP service pack... but in all reality, almost every feature that MS touts for Vista could have been implemented within XP if they wanted to not make so much damn money. Bit locker could have easily been done, UAC is basically like a hybrid user control system/ZoneAlarm-like OS firewall. The sidebar looks exactly the same as Google's does in XP. The new "search" thing is available for XP and Google makes an alternative that is essentially the same. They moved some "special folders" around, big deal.
To really summarize how I feel: What the hell were MS programmers doing all these years? This certainly doesn't feel like the work of years and years of man hours. The fact that even the UI running off the GPU would be possible to implement under XP (windowblinds does this for instance) makes one wonder if there is any justification other than profit for Vista to be it's own Windows version. Seriously, what the hell have microsoft employees been working on for so long? It can't be Vista b/c if they are that inefficient then they make the government look good. There isn't even all that much "under the hood"/"behind the scenes" stuff to justify the upgrade.
Don't get me wrong, I'm not going to uninstall it. It has more features yes, but it just isn't as big of a step as one might think 7 or so years of work might produce. Honestly, I feel it's about the same level of upgrade SP2 for XP was as it is to SP2. The only reason I could ever recommend throwing down the money for this is when XP is completely abandoned sometime in 2008. Get it with a new computer, but I wouldn't buy this thing. In case you're wondering, my copy was payed for by my company so it wasn't my blood money.
So that's what I think. It's not very elegantly written and I apologize for maybe not going into more detail but I'm tired and still half asleep. I'd like to hear what others who have been using Vista think of it so far.