Finally got to run Brytenwalda out this evening with my erstwhile chum's Scots-Irish getting a bit of drubbing at the hands of my Romano-British.
So, the rules (or, more accurately; the RULES).
Fast, fluid, and complete carnage. Considering that they're free, and in version/edition 1.1, very impressed.
There was some little oddities - such as a unit of 12 shield totting spearmen being statistically invulnerable to a unit of 6 javelin throwing Irish due to the way the modifiers work, and some open-to-interpretation bits on combat casualties. But as these rules are open source and explicitly state they're there for the tweaking, I think our discussed modifications may tidy it up a bit.
Firstly the casualty system need clarifying (or trimming down) to only those directly in combat, rather than the whole unit - otherwise one spearman can theoretically wipe out an entire unit.
Secondly I'll be putting some thought into how the archery can be effective against huge blocks (indeed, it should be better against large targets)
Thirdly just need to decide if a unit gets two or more combats per turn (one each time a unit engaged in the combat is activated)
Fourth would be to make orders issued at the beginning of the turn - although this will slow things down.
That's it - so all in all very good for no money and early edition.