I've been around Aeria for awhile, but I've been inactive due to various reasons the past couple of years. While I was a GS for 12sky2, the service was pretty good for that particular game anyways. The GM's were active and on point; and the GS's were good.
Since the transition of Soldier Front from Ijji to Aeria, I feel as if the service has dipped (for that particular game anyways). The GM's for Soldier Front aren't as active with the community, but the few forum active GS's make up for it in that regard. Although, the Soldier Front GM's from my experience do handle RT's fast and effectively. I have played Soldier Front since '08.