Pros:

Interesting.
New Models.
Tough Bosses.
Guns always available.
Small size.
Very Different.
UFO is the last boss.
Difficulty increases as map progresses.
Enemies range from trucks,cars,rocks,UFOs,weak tanks etc..

Cons:

Bots are useless.
Very Very Long for being so small in size.
Moving around is almost impossible.

Conclusion:

A must play map. I found it very tough that i had to do "sv_cheats 1" and then "god 1" in the console.
I found that some things were undodgable . Also each hit meant 5 damage, and the UFO does more. 
There a absolutely no zombies, though the "incoming attack" music cue played very often. I really struggled with bots. But, it is for someone with a liking for funny maps. The tanks could be killed with one shot with auto shotty. Also, when you shoot correctly the target glows red. This is a good map. I recommend it