Vista also changed a lot with the service packs. People's impression of Vista was Vista SP0, which was slow (horrible file copy performance) and in my opinion b

Vista also changed a lot with the service packs. People's impression of Vista was Vista SP0, which was slow (horrible file copy performance) and in my opinion barely usable (UAC prompts every five seconds). SP1/2 fixed a lot of those, so the jump from Vista SP2 to Windows 7 was a lot less dramatic.