Also, you are not restricted to any model range or scale whatsoever.
And you don't need masses of figures, to have a good game.
It encourages, rules tweaking and imagination.
Plenty of good support at the Ambush Ally Games forums or TMP.
You can also create you own alien races. Heck I know a guy that is currently making a Alien army based off of the Alien franchises for Tomorrow's war. Heck there is also a rule set (Ambush Z) that deals with monster. For example an AAR of a game based off of Dog soldiers (i.e. werewolves)
and don't forget zombies. http://ambushalleygames.com/forum/vi...hp?f=44&t=8362