I've just started looking into this myself. Actually, I almost impulsively bought a Ducky Shine for use with my Mac, then happened to stumble on a thread that mentioned Mac issues in passing, which made me panic a little bit
But, according to Ducky's site,
http://duckychannel.com.tw/DK9008S.html, the DK-9800S has only 6KRO when on USB.
Features Description:
Double-sided PCB traces, security.
Wiring separation, easy to carry.
All key light, dazzling charm.
Coated Cap, touch dense, fine workmanship.
DIP switch, define keyboard functions.
Product Specifications:
Support Interface: USB & PS / 2
Support N-Key Rollover (PS / 2), USB any 6 Key
Five sections of the light adjustment.
Three-stage LED light switch region.
Full keypad LED lights breathing pattern.
Special keycap opaque paint coating.
Support for multimedia keys.
Using Cherry MX series bearings.
Four key features shortcut keys.
Four-way DIP switch functions.
So, in theory, that means it should work on on a Mac.
Additionally, I saw another post somewhere (which I can't find now) from someone who said he got a DK-9800 G2 working on a Mac by using the keyboard in PS/2 mode connected to an active PS/2-USB adapter (mostly working, anyway, I think he said some of the media keys weren't quite right, but KeyRemap4MacBook would probably take care of that). So that might be a suitable backup plan.
Think I'm going to go ahead and get one of them to try out (if I can find one with Cherry MX Blues).