It's easy to set up. Just install the second drive, and enter the bios and enable RAID.
After that, you need to re-install the OS. You'll need to load the RAID controller drivers at the beginning of windows setup, press F6 when it asks if you need to load RAID drivers. Then it'll install the OS across the RAID array and you're set.
I've set up RAID on my laptop (m9700) and on a desktop, but I don't do that much hd reading and writing intensive work, so it didn't really make much difference. It did shorten load times during games a bit, but not much. I've since disabled RAID and use my drives independently.