Map 1 runs next to perfect on my 900 Mhz P3, 256 MB RAM & GeForce 3, but Maps 2 and 3 slow it down to a crawl. :(
Later on, I'm going to put it on my mom's monster lap-top and see how it runs, then.
And no, it's not the full version. It's the Alpha that was shown at E3.