other than dx 10, there is no other reason to really upgrade to it. I found that the default protection service that is enabled that bugs you about whether or not you would like to run somthing or allow somthing very annoying. Once that was disabled vista became much more tolerable. However I didn't see anything really that new about it compared to XP other than graphical improvements.
Does it make me happy? no more than XP does.
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