So I got my copy of Sword and Spear Fantasy a couple of weeks back and I decided to give it a try.
Being my first game with this system, I never tried the ancients/medieval version, I decided to keep it basic, so I built very similar small armies, but one of them was an Undead army since the rules have very nice and different mechanics for the Undead.
Of course being the first game we did a bunch of things wrong, and we didn't really fully exploit the rules but still it was a fun introductory game and hope to give it a try soon.
I like the fact that it is very open source and that you can use the army design to build pretty much any setting you want, I was using my wargods of aegyptus armies.
I posted a very quick report here:
http://www.thewargamespot.com/first-playtest-of-sword-and-spear-fantasy/Hope to try a bigger game soon..
Francisco