There will most likely always be flaws. This version so far seems very stable compared to some of the older ones, and personally i have only had one bug that i would rank as disruptive, but nobody else have made threads or posts about it, so its probably a pretty rare occurence. I cant see any reason not to go for the mod as it is right now.Hopefully they fix the problems in this update quick in another version. I'm kind of hesitant to have my first experience with this mod tainted by the flaws in this.
Edit: Oh yes and the Lannister religion bug but that is very easy to fix as was mentioned a few posts ago.