Playing as Bithynia now and having a blast. I'm going to save my experience for it's own post in the main forum but some feedback so far:
-Temples generate eastern culture but I'm listed as Hellenic. Didn't seem to effect me negatively.
-Bithynia has no dilemmas, just random festival/religious bonuses for a certain amount of turns. (Probably because theyre not playable vanilla?)
-Pike units, even levy ones seem to have a pretty high damage threshold even from the flanks. Attacking from behind produced better results.
-Building chains are unclear but I think this is due to the vanilla structure. Are you guys modifying it?
-Both as the Arevaci and Bithynia I haven't been able to build any siege engines from the building. Intentional?
-Enemy theuros spears WRECK anything their javelins hit. I had quite a few hoplite units break this way.
-The Bithynian heavy peltasts are good but despite the stats they don't do so well in melee. I wanted a good sword unit but had to rely on allied theuros spears because of their performance. Are they intended for flanking only?
-Your archer stats are
*just right* Against anyone with a helmet and shields they're not effective but are good at adding pressure. Anyone else gets eaten up, but not at an unrealistic rate.
Might try Carthage out next!