I just got windows 7 through my college and added it to my boot menu. It installed in roughly 1 hour and 20 minutes. On the same computer Vista took nearly 3 hours and XP took less than 30 minutes.
Windows 7 works well enough with all of my programs I use frequently with XP. Roughly 1 third would not install persay but simply copy-paste(ing) the installed files from my XP partition worked without any trouble. I am not too sure what to make of this. Some older games which worked on XP refuse to work on 7 still. I have my doubts as to whether or not any compatibility fixes will be made.
I only used vista once before purging the partition I had installed it to on my computer. It was at the time when it was first release. I had too many problems and felt that it just was not worth my time. I haven't touched it since.
This may explain why Windows 7's interface appears to be a catastrophe of ass! As well as it works in comparison to Vista, The interface is horrible compared to XP the changes are excessive and unintuitive for anyone who used XP or earlier version. I ended up having to disable the Explorer GUI to tolerate Windows 7. I'll probably use lite step sometime soon.
On a side note, does anyone know how to change the MIDI Playback in windows 7? It was smack dab infront of you in XP by simply going to control panel-->Sounds and Audio Devices-->Audio 'tab'. I can't seem to find it in 7