Their first game, Civil War: Bull Run, was a lot of fun. I'm not a big fan of the Civil War or even RTS games in general, but Bull Run definitely clicked for me. It's not as dry or boardgamey as most Civil War games, but it still has plenty of attention to detail for the nerds to obsess over. Keep an eye out for it at EB since there are still some floating around for $20 or less.
The only thing I didn't like about the TC2M demo is that it chugged a lot more than Bull Run even though the graphics looked the same. Supposedly, this one has newer, hi-res models, but they looked like the same old ones to me.