anyone know how would the 880 premium compare against the AD900s (open) i have right now. AD900 becoming more and more uncomfortable as they keep sliding off my head.
Ooo. I currently have the A900Xs (closed), and from what I've read on headfi, the ATs are supposedly more favored as they're less drowned out by bass, and has better highs and mids. I'd assume this would be a similar case with the AD900s. Unless you're looking for more bass, I'd stick with your AD900s. I'll be getting AD900Xs in a few weeks, so I guess I'll have to do a comparison with it against the A900Xs, as this hasn't really been done much.
I do agree that the Beyerdynamics look amazingly comfy. You can fix your "sliding off head" issue with the elastic band trick. I have a big head so the wing support of the ATs work wonders for me.