I've had mine for over two weeks now. Kept it 'burning' for about 10 days, whenever I'm not listening. So it's been running probably for over 200 hours already. I can't say the sound changed much, but I did follow what Hifiman suggested anyway.
Soundwise I really love these. Compared with the pre-production version, they seem a little bit more transparent, which I do prefer. I don’t feel any lack of bass as mentioned by some guys above. Actually the sound difference between the two version is very small, I can live with either one, but prefer the production version a bit more due to peace of mind (don’t need to take care of the wood cups or worry about the possibility of cracking later on). I don’t know how come some guys above feel the difference is so huge. To me they are pretty much the same, other than a little bit more transparent with the production one.
I’ve been listening to them mostly out of Merier Audio Corda Classic with HP-A4 as DAC, they sound fantastic. very transparent with great mids and bass, and excellent details too. I don’t feel it’s any bright at all, definitely not brighter than any of my other headphones, but my other headphones are pretty bright to many others I guess
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I also tried these with Herus together with a laptop, they sound pretty nice, but definitely feel lack of power. I guess the Herus just can't give enough juice for these. But I do enjoy watching some action movies with this setup, excellent impact and great sound stage, vocals are very intimate too.
I know these are not made for portable use, but we are gonna try it with our HM901s anyway, don’t we? I tried it with HM901 and Minibox card, they sounded fine, but definitely not to my like after I’ve used them with more powerful amps. Then I tried the latest discrete amp card (it’s an amp card made by a third party in China), they sound really nice, the details, bass and soundstages are all there, and the vocals are excellent too. I’m very satisfied with these alone if I didn't have a dedicated desktop amp. But I do feel these headphones deserve a better and more powerful amp.
Borrowed a balanced amp card (mine was sold long time ago) from a good friend, but I only got chance to make a balanced cable yesterday, not a fancy one but out of a Beyerdynamic T1 cable (Peacock MKII by SOMMER Cable Germany). Tried the HE560 with balanced amp card, well, I definitely prefer the discrete card more, it gives out more juice, has better high and low extensions, and the vocals stand out a bit more too. The balanced card feels a bit dry and plain in comparison. But I haven’t used any other headphones to compare with these two amp cards, the balanced card might match other headphones better.
Anyway, these HE560s are great for jazz/pops/soft rocks which I listen to the most, and I do enjoy listening to classic music through these too. Very comfortable to wear, but I only wear them when it’s a bit cool or in aricon room.
I didn’t feel any regret at all about selling off the HD800/T1/TH900 after getting the pre-production version, and I still feel the same after having the production one.