1. In short 8/10 for me.
Shame they didn't bother with a native version. I found the frame rate pretty low in places and quite choppy zooming in and out in space mode. The game concept itself is quite nice, but it's missing alot of game play. Somehow it reminds me of an updated Elite.
The real game seems to be Space, the earlier stages are just a series of mini games that don't really add much to the game imo. Although space also suffers quite some issues: Mainly occasional crashes, save often!, not enough tradables, constant attacks by pirates,ufo's,other races that involve you rushing from planet to planet to help out. Even when you get such great sounding weapons as the uber-turret, it dosn't seem to do much unless you go and babysit the planet while the defenses kick in. Ignore the attacks and they seem to get less, but then you end up having to pop back to planets now and again and spend time micro-managing the repairs, adding missing turrets back etc. Don't see the point of the Grox so far, I guess they are just a place filler until there is enough online content...
2. SR Mac Pro 2.4 4GB RAM, 8800GT