Indeed a great mod!
And the units are the best I've seen (Even if Im delighted with the ones that are on Terrae expanded by Lusted).
Still didnt tried Gersh version, but yours v4.0 patched works as a charm and was already ambushed on the 2nd turn playing as Sassanid by rebels and Ere armies.
The combats where chalenging and at the right pace to enjoy the remarkable graphic work of Your's.