I finally got around to do some high-level break-in today, a bit more than an hour total (at a volume high enough to give a good idea of the music in the whole room). That helped the smoothness of the highs in particular, but I think the slight hollowness has decreased as well. My EQ has slightly changed to this:
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And btw, I can only repeat myself: "Whoa - these are €25 cans?!"
Their general construction may still tell the price level, the sound most certainly does not. Give them some EQ, and they'll perform well above their price range. (The angled drivers are a nice touch, btw.)
A note on looks: In spite of using a similar silver as the HD497s, these cans actually look rather pretty. Possibly that's because of the larger size and more black elements. I could still imagine another color for the back grilles, but other than that, the design is well done.
Oh, and something else I'd forgotten: The weight is rather low, too. Not feather light à la HD590, but not far behind either. Clamping force is moderate, the available depth inside the earcups is generally sufficient but if your ears stick out they might touch something in there (I'd suggest trying different earcup positions until one finds something that's comfy).
EDIT: Oh, and it looks/sounds like bass response drops off quickly under ~40 Hz. That's plenty deep enough anyway.