Its very nice. I would wipe Vista though. Asus was a good choice because they are nice and give Vista drivers. Additionally, if you have a Centrino platform, Intel is good with XP drivers.
The other thing is that you will need identical memory for dual channel. Take a look at this:
http://www.newegg.com/Product/Produc...82E16820146125
If you do want Vista back, you can always use the recovery CDs or partition which will restore Vista with all the drivers.