few improvements over vista, if you have "ok" spec computer there isnt a great difference from vista tbh a little bit quicker nothing really noticable. On the lowest spec pc in the house, p5k, q6600 clocked to 3ghz. 4g ram, 4870 you can just about tell the difference.

Its more of a vista "slim" than a upgrade. As in the ps3 slim is to the normal ps3.