Indeed, it has gotten very stable. The first few iterations of this patch were poorly optimized, but this most recent has taken great strides (aside from some teleporting mobs and players) from even where Live servers are at right now. I noticed that I was not getting lagged down as bad as any iteration thus far.
Honestly, I think this testlive patch could come over to Live with only fixing the boss spawns in the new dungeon, and it would be acceptable (by most). Fact is, there are a LOT of bugs still in the game, but most are just annoyances and not game breaking.
The most game changing thing needed right now is an AI Overhaul for NPC’s. Fixing the AI and making thralls more user friendly would go a long ways to making the game feel very polished. It’s the only system that you can’t really get work arounds for. (Adding more character creation options and dances for entertainers could make for a complete patch where the whole team would have work.)