If you are looking forward to enjoying Subnautica multiplayer, note that the game does not have an official mod. The Nitrox multiplayer mod is fan-made, created by users who loved the game and decided to add a co op mode to it.As for reliability, the mod is running just fine. There are some hiccups and bugs, as with any mod at an early stage. However, Team Nitrox and all the users contributing towards the mod are constantly working on fixing the issues and improving the mod.