I am currently running Mac 10.11.3 El Capitan. I have the Poseidon ZX, and for my case, the problem isn't that the keyboard isn't recognized, but the functionality of certain keys. For instance, the spacebar, backspace, and tab keys, and arrow keys don't work. and whenever i type the 'D' key, it types d, but then skips a couple spaces after. when i type 'F', it'll skip to the next line, and 'C' back tracks to the previous letter. Making it pretty useless on Mac. I tried the steps details in this forum but unfortunately, it didn't fix the issues. I also tried this on Mac 10.8.5 and it didn't work. On the Windows side of things, this keyboard works great.
Does anyone have any suggestions to get it to work properly for 10.11.3? I would hate to return this keyboard but will have to if it can't work properly on the Mac side.
for those who have gotten their keyboards to work properly on any version of Mac, you can use the program Karabiner to remap the keys to better fit a default mac keyboard layout.