The best gaming headset available. Crystal clear sound, the best mic in its category, velvety earpads and headstrap that don't tire you no matter how many hours you play, and allow your skin to breathe without sweating. Additionally, the clamping force is minimal, so you won't feel any pressure even after hours of use, unlike other headsets. They are open back, which means that sound comes in and out freely, so they are only suitable for home gaming. Due to their nature, they offer a large sound stage, meaning excellent sound spatial awareness, perfect for FPS games like CS, PUBG, etc. Look into it and you will understand what I'm talking about. If you want to play in noisy environments like internet cafes, look into the Game Zero, which are closed back for sound isolation. And for the love of God, don't waste your money on gimmicks like Razer, Corsair, HyperX, SteelSeries, and other overhyped headsets. You know, the 7.1, RGB, and other advertising tricks. If you want to play properly (at home), go for stereo, open back. If you want music/movies, play around with the EQ on your motherboard or sound card, which you already have, and you're good to go. I say all this having tried almost all popular and good "gaming" headsets, not because I read it somewhere from someone who heard it from a friend. 4 stars only because there's always room for improvement and perfection doesn't exist at 150 euros. If you want 5 stars, go for other audiophile setups with HD 650 + mic, but then we're getting into a different budget range.

I bought the gaming ONE and the first thing I did was to test them comparing them to the gaming ZERO that I had and broke. In terms of sound quality, both are incredibly good but with significant differences.
1: The gaming ZERO, which are closed-back, you simply wear them and lose contact with the environment (you only feel earthquakes happening around you), with the ONE, which are open-back, you can hear what's happening around you.
2: The gaming ZERO had better pads, so they are more comfortable (I took them off and put them on the gaming ONE, so it's fine), but the ONE is also comfortable. Compared to something like Razer, SteelSeries, etc., there is no comparison, the ONE is far more comfortable than those garbage ones.
3: The gaming ZERO is not suitable for music or movies, only for gaming. They are for competitive modes, where you only hear footsteps, gunshots, and again footsteps. You can hear Teamspeak clearly and also footsteps. If a grenade explodes nearby, you can hear it clearly along with other sounds... it's like a cheat sound... (I got banned in CS because I could hear them while others couldn't). The Gaming ONE is much better for music and movies, and in gaming, you just get lost in the game, you can hear everything but differently, like being inside the game. As for footsteps, you can hear them, but to reach the level of the gaming ZERO, you need to adjust the settings, like lowering the bass because in an explosion, the sound covers everything as if it exploded inside your head (you hear them more cinematically).
4: The ZERO requires a good sound card, while the ONE works well with the motherboard.
5: The microphone is the same in both, incredibly good for a headset.
The gaming ONE is like the GSP 500, just with a different design, and the gaming ZERO is like the GSP 600.