
Aion did a step back, it reverted to beta stage due to the change of publisher in Europe and to the migration of their model from subscription to free-to-play. I was never a fan of the new European publisher (GameForge), in fact, i hate every single game they have but that's mostly because of their choice of games, not their quality of service.
Anyway... I got my hand on a beta key and I have been playing Aion for 2 day now. So far I can testify the stability of the server, but then again this is a closed beta so the number of players around is only a fraction of what it will be on relaunch, hopefully they will have this covered...