You may want to know how the game is. It is fun. 9 missions of crazy combat action. It is not a delicate tactical exercise like Space Hulk. But it is a frenzied mass attack on an elite strike team by a horde of ravening, xenos-infected fanatics. Dice will roll. Hundreds of xenos will die. A few Marines might even die. The GS player has to manage a hand of cards for maximum effect, using wither ambushes or special actions called gambits. The Marine player has to choose a strike team of Marines who each have unique special ability or two. There is no cover or rough terrain as such, bit due to space stacking limits, actual placement is an important part of the game. You'll laugh, you'll cry, you will make sibilant hissing noises and hail the Emperor. Jump in and get fighting. It's a lot of fun.
Here is my set, all painted. Yes, I am kind of proud. Purge the alien, brothers. Or, glory to the four-armed Emperor. Either way I am as happy as a little girl.