I've tried the bose ae2 many times (they seem to be around me quite often) and have always come away thinking these aren't half bad you know. Not great. I won't wear them. But they're not absolute beats by dre level ****
For an ultra ultra comfortable portable headphone that sells for only a hundred pound (somehow cheap in nowadays) it's okay. My ears tell me it easily beats the socks off the dt770 pro 80 and the dt770/600 (bass hole version) in terms of sound quality by the way and for that reason it doesn't even half deserve the bashing it gets around headfi.
My story with the d7k burn in is pretty unbelievable but i'll say it anyway.
I didn't notice not a single thing change sound wise when I was burning them in between the 20hr and the 500hr mark. During this time of burn in I was not wearing the headphone alleviating any possible effect of pad burn in. I compared the d7k to a now disused (but well burned in) d2k to test for d7k burn in effects, from an invariant setup and source. Actually I especially listened out for sibilance as at both the 20hr and 500hr mark, still the d7k had a harsher treble to that of the d2k, by a considerable margin- around 300%.
All this basically meant was that the d7k's were unusable for me. I couldn't hack their screamy, sharp, aggressive, bumped up, tinny,........ high range so I put them back in their box and was going to flog them when I had the time. Hmmm, I had a good idea though. You know them nuts on headfi talking about burn in only coming into existance after a certain thousand hours- how do you know the falsity of their statements? I mean had I ever tested for it?
Not really no, so I decided to put my money where my mouth was and let the d7k burn in for, yep, nearly 2 months during which time I never once touched the phone. (The burn in audio was a steady loop of 15 miniute pink noise with a 45 second period of silence on the end.)
When I for the final time pitched the d7k against the d2k to see for burn in effects the difference was very clearly noticable. The entire treble ranged problems had decreased easily by half and now they were only slightly more brighter than the d2k.
So yea, burn these new denons in folks but i'm not sure when it'll click.