How do they (the deltas in particular) compare to the rock jaw alfa genus or the sound magic pl50? I've just picked up the ag this week and I'm impressed (champagne filter is my favourite so far), but my pl50 died so i can't do a direct comparison myself. However, I don't think I've ever loved headphones as much as those pl50s, and it may be nostalgia speaking but I don't think the ag is quite as tight. In fairness, though, the ag is better built by far and the bass is stronger than I recall from the pl50s. Much prefer the sound to my long-gone er6is, anyways, and a think they're a league above my meelec s6p, too.