I use these as a second pair for mixing, and for listening back to the master. These headphones have an excellent, naturalistic, non-fatiguing sound. So convincing that I have on one occasion forgotten that I was not listening through monitors (I accidentally walked away from my desk with the headphones still on my head).
Good for the initial mix, and for getting a good overview and sense of balance of the mix, but I suggest you may go elsewhere for surgical work. I prefer something like the Sony MDR-7506 for its ability to highlight the ugly, mid and high frequency range. Of course, being open-back, the spill means I would not recommended it for tracking.
Heavier than average, but the headband is comfortable; not being too tight while still secure over your head. Certainly more comfortable than the Sennheiser HD-25. Ear pads are a velour material which, while not exactly making for a sweat-free experience, at least isn't vinyl or fake-leather. I wouldn't like to use these in high-temperature, high-humidity environments, but I don't know of any headphones I would like to use in those conditions.
While the construction is a mix of plastic and metal, the only part that feel flimsy are the plastic ear cups, and not the first area that I would expect to get damaged physically.
Concerns? Cable noise does transfer to the earpads. And the tight, short coiled cable may or may not suite you (the weight of the cable is not insignificant on your head especially as it's only on attached on the left side). With an impedance of 250 Ohm, just make sure you are feeding it from a source with enough drive (for reference, my phone would not drive it, but, surprisingly, my old laptop has no problem with it). You should not, however, have any issues with most mixers or audio interfaces.
At this price point, I'm can't think of a better sounding pair of open-back headphones. Recommended for mixing and listening.