I actually didn't have any issues with Vista. I liked the new UI design, UAC could be turned off so that wasn't really an issue. I never had driver problems because I kept my hardware and said drivers up to date. If I were to say one thing negative, it could be that the transparency for the UI elements was a resource hog. GPU's at the time lacked the muscle and the coding wasn't the cleanest, but in reality I never had an issue.