To be honest, theyare a bit complicated for such a big game. As soon as there are a lot of troops firing and in melee, you have to perform morale check after morale check, this can be frustrating for those who are not in contact yet.
I have bought the crusader rules Rank and file this weekend at the Lille show (congrats by the way for the Marie Louise de Flandre for this first show in their town) and these seem more fit for these Mega battles,
we'll test them out a.s.a.p.