Just got done demoing a pair of these (hf thread) from ttvj. From everything I had read, I thought these would be my perfect cans. I have to say I was disappointed in the bass response of these. I compared them throughout with my modded T50RPs, and in most cases the T50s won in terms of enjoyment, even for classical (Shostakovich, Mahler). The T50s have some midbass coloration that the Aeons don't (seemed pretty flat to me), but I had a really hard time engaging with the Aeons. The T50s bass also goes deeper.
I also just got my set of the Massdrop Hifiman HE4XXs, and I do like these. Beth won't like them (open)