Works very well for me iMac & Win10, with GSP500
I've had the GSX1000 Amp (and GSP500 headset) for about a year and they work extremely well together. The virtual surround sound (7.1) from the Amp is exceptional. The main game I have been playing is Realm Royale which produces very complex "3D / 7.1" sounds - I can hear all the sounds clearly and tell what direction footsteps, mounts, gunshots are coming from etc. Even though the 7.1 surround sound is simulated (Headphones only have 2 speakers after all) the sound is very realistic and sound direction is easy to determine after a few hours usage (I think one's ear (brain) has to learn how to use the virtual sound?).
The Amp works well with my 2017 iMac (and Win10) games.
The controls on the Amp are amazingly well setup and easy to use.
I had no trouble setting up the amp under Win10, and slight problems on my iMac. If the instructions are followed very closely they get you there! Once setup the Amp has worked faultlessly every time under Win10 and MacOS.