Hi,
Upgraded DELL XPS M1210 (Centrino Duo T7200@ 2.0GHz; 2 GB RAM-667MHz; 100GB 7200RPM; nVIDIA GeForce 7400 GPU)running XP-Pro to Vista Business as part of the Dell express upgrade.
Did this with a great deal of apprehension.
I must say, went off real smooth.
Though not too different or special from XP, it does have lots of new and convenient features... and looks real good ...and so far so good....very stable, unlike so many previous windows version.
I use it for word processing, presentations - all the basic stuff. I also do lots of photo editing, and occasional video editing
The only problem I had, was with my DVD writing software (Roxio - which I had to buy) and Norton Internet Security 2006 (which I had to upgrade to 2007 - free, thanks to Dell).
My advice..
If you are upgrading as part of your PC Manufacturer's upgrade program, go for it. There WILL STILL be a few surprises such as my Norton.
If you are not on an upgrade program, you are on your own. What I would suggest is running the Windows Vista Updgrade advisor from Microsoft. Go to your PC manufacturer's website to check out, if they have their own upgrade advisor (Dell, HP, Acer have theirs; others might too) especially regarding drivers.
Before all this, do go through CNET's review to find out if YOU really think its worth it for YOUR purposes.
All I can say, it worked for me
Good luck