Some info, this is an updated version of the xbox360 version called Alien Breed: Evolution, its mostly a bug fix.
I have played and completed Alien Breed Impact. And I'd say save your money, it's very short and doesn't have that edge it had on the Amiga and any console conversion.
It's a bit boring and repetitive to be honest, only six levels - mind you they are quite big maps. It's good that Team 17 have pay'd tribute to an awesome game series. The control system will make you dizzy. And it is a shame that they've used the Unreal 3 engine, I'd of liked for them to have built their own system.