re: Recommendations for wireless keyboards that are Mac and Windows compatible?

I think the issue is the Unifying Receiver software, but you should be able to pair them to the receiver on your pc and then just plug it in your mac. The multifunction/media keys probably won't work though. You can then use something like DoubleCommand on your Mac if you wish to remap the alt/cmd keys

*it should come pre-paired, but I have seen a time or two that it was not