The Ambush Alley rules were suggested to me by the TMP crowd, more specifically "Tomorrow's War" which is their ruleset adapted to Sci-fi. Sadly, these rules are not yet available.. Which makes it hard for me to buy them.
So I went and downloaded the quickstart version of Ambush Alley to see what the mechanics were like. The game is designed for small numbers of figures on a small table and has really nice and quite simple mechanics. It is clearly written and easy to grasp.. In fact I think it's one of the least confusing rule books I have ever read. In short, they seem to be great!
They seem so great that I was tempted to just get Force on Force (Their more recent set) and mod it to my own liking. I'm holding off and hoping TW just doesn't take too long.. If TW was available to buy today, I'd buy it without hesitation.
I will try to play the introductory AA scenario one night this week with my sci-fi figures and see how it goes.