Yesterday I upgraded my Windows Vista Business to Windows 7 Ultimate. And I have to say, it made a real difference.
First of all, the waking time has shortened by lots. When I wake my VAIO Z530N laptop from standby, everything is just there; no waking up message, no delay, nothing. And resuming Windows from hibernation is also a lot faster. With Vista, it took about 2 or 3 minutes to actually get the system running. With 7 it is less than a minute.
All in all, I don’t regret having updated it. The only thing I have a problem with right now, is my built-in MotionEYE webcam, which is not recognized by Windows.