I can see why this is classified as one of the better HL2 mods; the atmosphere is great, the combat is more weighty than the vanilla game due to the premise, and some of the set pieces are incredibly interesting.

It's not without flaws, though; both of the bosses are bad, ranging from slightly annoying to not even knowing if you're progressing till it's already over, and playing on the difficulty that makes the game most interesting leads to it being so wholly unfair that anyone who played on it would be forgiven for either cheating or giving up at some point.