Yes, PoSH was one of my first. I started reading manga just when it started coming out stateside. Actually, come to think of it, it may have been the first series I followed completely from beginning to end as it was coming out in the US.

ETA: *stupid overeager "enter"* I adore the genre myself (kinda obviously). Part of it is the mythology and atmosphere and imagery and mystery that are pretty much automatically connected to it, but Ithink there's more,