So the Game One seemed like the answer to all my gaming needs, especially as an upgrade to my ageing Logitech G430/230. An integrated volume control and mutable mic go towards this being an amazing all round headset for gaming. The build quality is very nice and I love the styling of the headset (Black/Red). The sound is very clear, compared to other gaming headsets I have used including Razer Krakens, Razer BlackSharks, Sennheiser 350SE and Sennheiser 360. They are open-back cans which really help with positional audio in games like CSGO, driven by my SoundBlaster Z, but obviously do not isolate you from external distractions (Google closed vs open headphones). I tested the microphone with both subjective recording listening and opinions of my gamer friends over voice coms such as TeamSpeak and Mumble. This mic is superior to all the previous mentioned headsets and is way beyond the needs of the average gamer and even perhaps game casters/streamers. There is a nice addition of a detachable cable which allows for a relatively cheap repair if you break the cable with a chair/kid/hover/pet; something that a lot of gaming headsets lack.  
 
I can say without a doubt this is one of, if not the best gaming headset available. But, and there is the but, my 598's are just better. Supposedly they have the same 50 ohm drivers but the technical specifications are different:
 
Game One:
15 - 28000 Hz, 94 dB Sensitivity
 
598:
12 - 38500 Hz, 112 dB Sensitivity
 
Now, this was not supposed to be a Game One vs. 598's review, but the 598 ruined the Game One for me. It’s not to say that the 598s are amazingly different because they are not night and day different. The 598’s are just a little more open and airy leading to a slightly bigger soundstage. This gives games a more immersive feeling and allows for better location of footsteps and other positional audio cues. The clamping force on the Game Ones is also harder, and again if I hadn’t used the 598’s would be fine but the 598’s are just more comfortable. The ear cups are smaller on the Game One, just small enough that they sit slightly on the ears compared to the 598’s that surrounds them. Interestingly, my 9-year-old son preferred the Game One for comfort, they seem to be almost made for smaller heads (Not that I have a big head, I’d say average sized when looking at hat/helmet sizes etc.). Musically, the Game One’s are really good compared to any other headset I’ve tried. However, again the 598’s is just a little better, with greater clarity and separation.
 
TLDR: The Game One is an all-round awesome headset, with good style, great sound quality, much more than adequate mic, convenient volume control and even a detachable cable. If you are purely into gaming and want a convenient and great sounding headset you can’t go wrong with the Game One. However, for a little bit more money and a bit of inconvenience of having separate mic/volume control. The 598 is better for gaming, and noticeably better for music and comfort.