Not sure if the upgrade is worth the hassle of backups and reinstalling everything, but my friends say its a significant upgrade. Some things about my computer:
4 GB ram (displays as 4GB in System menu in Control Panel, not sure if its using full memory)
2 GHz Dual Core processor
5200 RPM HDD
128 MB nvidia video card
If its going to be a big performance upgrade I'll do it, not sure though.