I played with a theme that was supposed to make Vista look more like 7. Personally I kind of like the stock Vista. But 7 from what I've read is basically Vista tweaked. A friend I talked to who was using 7 said if you have Vista 64, there wasn't really a reason to upgrade because you didn't gain that much. If you have Vista 64, look online for Vista speed tweaks, some of those tips seemed to speed my system a little. But I'd say it's worth it if you got it with a free upgrade. I know one major thing is it's supposed to be quicker, personally though I think if you are going to run Vista or 7, you should be using something quicker anyway, so may not be as of a deal more most readers here.