A little different than the others. Way more cinematic cut scenes, more than one character to play with and very short. Taking that into consideration full price is way too much. Rest is okay, nothing really new or ground breaking here, most importantly, shooting is still fun. Speed running it with the Raptor was interesting.

I got the game for 4 euro from Humble Bundle. Great deal at this price.

Superb retro shooter.
This game isn't revolutionary but it is still a great deal of fun. It refines the best qualities of the previous two titles, creating more linear but fun levels filled with varied enemies and great weapons including returning favourites like the Cerebral Bore. Also the ability to select from two characters with different abilities allowing each to access to new areas in the levels adds to the replayability.
Well worth experiencing if you enjoy a good FPS.