It played fairly well, though a tad complex in a couple of places. The basic mechanic was beat a target number with your dice roll. Each unit rolled two dice - one a Quality die and the other a Technology die. The larger the die size (d4, d6, d8, d10) the better you were obviously.
The various vehicles had multiple weapon systems, some with ammo limits, and arcs of fire depending upon turrret placement etc, and a fairly detailed damage system for the vehicles (if you wanted - you could play with a basic hit points system for speed if you prefered). When you bought the miniatures, they came with their stats card which gave you pretty much everything you needed to know about the unit, though most units were covered in the basic rule book.
The army lists were very nicely structured and followed the particular doctrines for each race (pretty much EA, Narn, Centauri and Minbari only - the game never got a chance to develop fully, and the Centauri didn't get a full force book the way the other three did). You couldn't put an force together without it being "realistic" - the selection rules wouldn't let you, but it was down to the player what basic type of force he was constructing (Recon, Infantry, Armour) which changed the empahsis of the Squads and Platoons you were purchasing.
Infantry was organised as stands of 2-5 individuals, all vechicles were unbased and the ground scale was 1:1 and line of sight being pretty much exactly what you would expect. Figure scale is 10mm which is roughly equivalent to N scale/gauge train stuff, and scenic items for those work wuite well (asd does some of the Warmaster stuff...).
The rules books were relatively cheap, you could also buy spare cards (especially if you were making susbtitutions...) but the miniatures soon mounted up in price.
There were some tournaments run, but never saw one myself, but the games I played flowed very well, and it was very satisfying blowing away Minbari with the EA (the Jammer made them hard to hit, but boy were the Gauss Cannons on the EA tanks dangerous...).
It's worth picking up if you see it (or see below), and playing with some stand ins. If you like it, you should still be able to pick up sone miniatures from
http://www.agentsofgaming.com where the on line shop is still active and Bruce is selling off stock that he managed to purchase back from wholesalers. When Mongoose gets War Without End finally underway, the miniatures will lokk strangely familiar, but I suspect it'll be a damn good game in its own right, certainly the preview given a while back looked very promising.