We played our first game using the draft version of Dux Bellorum last night. Saxons v Sub-Roman British. We kept things simple so didn't use any special rules.
The game was great and all done in under 2 hours despite lots of looking in the rules to clarify things. I expect we got a few things wrong but overall the game was cracking.
The rules are due for publication in August, from Osprey. I already have a set on pre-order.