chetroithis website is real, I have ordered 6-7 things from here. The only real "issue" is you have to wait about twice as long for shipping because massdrop makes a group order, gets the bulk order shipped to their warehouse, then repackages and reships the items to individuals who bought into the drop.
chetroiYes, all legit here - if you don't already have the ATH-M50 - what are you waiting for. The easiest to recommend headphones, hard to find anyone who doesn't like them. :-)
The only thing is what Kaboose mentioned, shipping definitively takes a bit longer due to bulk orders and repackaging (though not in all cases) - so if you need things fast, this is not the place. However, you will receive great deals when not in a hurry.