I've gotten some good deals from Massdrop, but their forums are a farce - good people asking questions, and "volunteers" hyping the gear beyond belief. Hopefully their users will look around and find other audiophile forums.
Not only that but the product descriptions are often farcical too, like this from the AKG K7xx description: "The lows have been jacked up by 3dB for fully immersive stereo imaging.
" WTF that is supposed to mean is anybody's guess, but it doesnt't sound truly informative to me. That is one reason I've never pulled the trigger on a massdrop; another is the lack of clarity regarding warranty status. They had a 'drop' of the Shure SE535 awhile back in which the copy said to ignore unusual characters on the box. That suggests 'grey market' to me. I suggest contacting the mfr of anything you buy there and confirm that warranties will be honored. I was also suspicious that they listed the K7xx as 'MSRP $699' which applies to the Austrian-made 712 Anniversary, implying that's what you're getting, whereas the 7xx is made in China (Harman's parent company Samsung moved all AKG production there for the usual reasons.) Nothing against China, the headphone may very well be just as good, but the marketing feels misleading if not deceitful. As with any purchase, caveat emptor.