Long story short, a family member inherited my Apple aluminum keyboard this Christmas, so I was on the hunt for a solid backlit low profile keyboard with Mac support. Um, there aren't any. :sigh!:
Decided to take a chance with a K70 MK.2 lowpro, hoping I could install some open source s/w and make it work (if necessary). So happy to find this thread via some Google searching.
I was able to quickly update my K70 firmware, and change the h/w profiles (I'm running MacOS 10.13.6, holding out 10.14.3 or .4 before jumping to Mojave).
I'm impressed, and can now recommend Corsair to my fellow Mac sysadmins and coders. This is a great keyboard, and with this iCue software, it's a no-brainer. Certainly worth marketing this keyboard towards Mac users.
Thanks again for the MacOS iCue port!