I was searching for something (don't ask) and came across an interesting post about upgrading to Microsoft's latest OS:
My initial reaction is that the fancy UI effects make things feel a little sluggish, but there are some very interesting improvements as well (and the visual effects can all be turned off).
The amount of times I've heard that in the last few months about Vista is crazy, but heres the funny bit. The post is about XP. Which made me think back to that and yep I ran XP with the themes turned off for ages (get those few extra FPS out of Unreal '99. By the time I upgraded to Vista toggling themes in XP wasn't even a choice, it wasn't done. It made windows seem odd. Now comes Vista and here we are again. Guess what's going to happen in the next four years? ;)