Played most of the way through version v1.09.20beta this weekend, so here's my feedback after completing turn 423.
Game settings were: playing England, Archipelago map type, standard map size, King difficulty level, standard game length, and start era of Ancient.
Additional mods were: Beyond the Future (v1), Blue Mosque (v2), Globe Theatre (v1), Hukkak's Wonders Pack (v2), Improved Notifications (v6), Moai Statues National Wonder (v1), No XP Cap from Barbarians (v1), Red Cross National Wonder (v1), Resource Discovery (v1), Scientific Buildings (v4) and Wall Street National Wonder (v1).
The game was very stable and only crashed once, around turn 200, when I left it running overnight instead of shutting down my computer. Was able to easily resume from the last autosave, though, so this was not a problem. Did not notice any interference from the extra mods I'd installed (sorry - I'm an admitted mod junky).
The game's AI seemed to be working much better, as the other civs were actively conmpeting with me to bribe city states, rather than mostly ignoring them like in the Vanilla version of Civ-V. This made the game much more competitive. The other civs also were more likely to gang up on the game's point leader, which was me after about turn 175.
Except for the first 50 turns, it was not too hard to keep earning a decent money income and have a decent happiness surplus. I call this a big improvement!
Noticed that it became harder and harder to bribe city states as the game progressed, with gold progressivley buying less and less influence. This was an interesting change, as it had actually been too easy to bribe them before. However, bribing eventually became too tough, as it finally told me my influence would go down if I sent any more bribes. I can understand getting zero additional influence at some point, but negative influence changes hint at a mod formula quirk somewhere.
Had originally wanted to go for a Culture victory, but mistakenly annexed a city state when capturing it. Didn't think this was a serious problem at first, as I planned to raze that city later. However, after playing for another hour, the game would not let me raze the captured city state, saying I could not raze captured capitals. Had not known that captured city states count as capitals. Is this a feature of the Balance mods, or part of the Vanilla game?
Oh well, will try to finish the game later this week by going for a space victory or a highest score victory instead.
Thanks again for creating the Balance mods. I wplan to test your latest beta version next weekend.