Works on my laptop with a 3200 mobility Radeon quite well, good engine but the shadows are an extremely big performance hog.
Turning them down 1-2 notches results in 10-20 more FPS but looks identical...bizarre!
I never play it on my laptop though.
Oh and by the way, if you force AA via your graphics card options instead of using the in-game settings it tends to look a little nicer and run better in my experience on a 4870.

Can't believe how old the game engine actually is but it still looks quite nice, the lack of jaggies does wonders for it. Grizzly Hills is probably my favourite zone. (for design/visuals)