Well, I ran the first Dux Brit game. It was a solo, a Saxon raid on a Border Tower.
I really enjoyed it, although I can't promise I didn't overlook something in the rules! I didn't have any problems interpreting the rules, but that doesn't mean I won't in the future. My main takehome points were:
A few observations - shieldwall was incredibly useful - ignoring the first kill on a group makes a MASSIVE difference. Missile troops were useless, neither set achieved anything, not even inflicting a single point of shock between them! The morale table is a killer. The main thing that lost this for the Saxons was some lousy luck on the morale table rolls. Better luck with this, and worse luck for the Brits might have seen a different result.
Here's a full writeup (bit picture heavy!):
http://mitchwargaming.blogspot.co.uk/2013/09/dux-britanniarum-first-game-raid-on.htmlAnd some taster pictures:
The battle is well and truly joined at this point, and can still go either way.

Closeup of the British levy crushing the flank of the Saxon hearthguard