Thanks for the kind words! We put a lot of effort into getting these units right, so I'm happy to hear you guys like them so much : D And yes, please check out the africans too, they're a cool bunch, might be my personal favorite (camels! : D).
As for the shield, I'm gonna explain our thoughs on that one too : )
As I mentioned earlier, when designing these units, you have to take bits an pieces from maaaany different ages and eras in the army in questions (hence, we gave them the axe to remind everyone of the vangarians : ) ). Using a viking shield, we though was maybe a bit much, since we still wanted people to relate these heavy infantry guys to the byzantine troops. Looking at our historical sources, and the pictures we had at hand, the arab "teardrop" shield seemed much more common than the vangarians round one:
http://img355.imageshack.us/img355/1796/byzantineinfantry1wf.jpg
http://img392.imageshack.us/img392/9150/photo20058142124265mkjj8.jpg
(Pictures by the great, and late : ( Angus McBride)
THus, we went with the "most common" one, since the CKII-units are supposed to combine a lot of different aspects from the era/culture into one big "generic enough" look : )
Hope that helps! : )
awesome work Lando