The leather band, so far, is OK in my case (used hawks + fairly new owls). Maybe, if this problem starts to appear, I guess it can be avoided by gluing some extra leather material on top of the leather band, where it meets the suspension.
Keep these birds flying - I am fairly new, into this, and can only say, I agree. They have given me much better audio, even from so-so sources, than I had anticipated. Maybe some of it has to do with my listening preferences. I don't mind "dark" if I can hear more natural voices, more ambience, more nuance, texture, and instrumental separation.
I come from the Sennheiser HD600, AKG 701, and a Stax ,all quite capable in their ways - yet there is no doubt that the birds are a substantial step up. More musical enjoyment, for me. I am impressed, especially, by how they reproduce high quality (DSD) files. With the increased resolution, I don't hear much "darkness" in a negative sense. Maybe other headphones do better at pinpoint, fast response, flat frequence, signal/noise - I don't know. But for "musicality", these birds seem hard to beat. Maybe, to avoid the stereotype, we should call them "day birds".