Great value, but
Context. I'm neither a gamer in the sense that most people use the word (I bought my first console a few years ago at around 40), nor am I an audiophile compared to the audiophiles on the internet (my desktop rig is a Topping D10 -> JDS Atom).
Sound is solid. For me, nice things like wine and headphones are always a value proposition. My palate can distinguish between $20 / 50 / 100 bottles with relative ease, but not in a way that leads me to believe the 100 is worth the marginal cost. Likewise headphones -- I just don't see a whole lot of return once you get in the Senn 650 range of cost/performance. Yeah, I can hear the difference, but. In any event, I'm impressed with the Koss GMR. Decent imaging and clarity, not bass heavy given the closed back. Although I haven't done extensive listening yet, and haven't done A/B with my other cans, I would offer that these are likely sufficient to give someone their first taste of real headphone sound (ie., ruin their ability to listen to music on entry level gear). Tends to sound a bit warm. And while I recognize that they are not directly comparable for a number of reasons, I would pull these out over my Audio Technica ATH700 (which I use for gaming currently) almost every time.
Design is, well I'm confused. I didn't look closely at the the wire setup of these before I bought in, and since I'm not a gamer maybe some people can set me straight. But I find the wired and mic setups to be not intuitive. There are two main cables included, one long one with integrated boom mic that terminated in separate mic/audio mini plugs. (There is also an adapter that the separate plugs in a TRRS single mini.) The other cable is short and has an inline mic.
This design seems to be both too modular and not modular enough. Example: conceivably, the short cord is best for plugging into, say, my Xbone controller. The other cord is far too long and unwieldy for such use given you need the adapter and who wants that much cord piled in their lap anyway, etc. But when used in this way, I don't get the boom mic and I have to deal with the inline? The quality is okay, I guess, but I kinda thought the mic was a big part of a gamer's headset, and I didn't know that only people playing on PC want a boom instead of an inline.
In any event, there is something I'm just straight missing. The Drop copy suggests "you can plug the boom mic into a PS4, Xbox, Nintendo Switch, or other console without hassle." What does that even mean? Literally. I mean, I can technically plug the boom mic (along with the rest of the 8' cord) into any mini jack, but that's not exactly a selling point because why would I?
Bottom line. Outstanding value but design/implementation of some features is confusing.
Would recommend to a friend.