As a Mac owner, let me go on record to say: this blows.
Steam Machines may be a losing proposition, but that shiny new Steam Controller, as well as the Steam Link extender, both look like they would be pretty damn useful for just about anyone with an interest in PC gaming. Unfortunately, if you own a Mac, they won’t work for you- Steam Link and Steam Controller are apparently not compatible with Mac, even if Steam is installed.
The issue arises because the Steam Controller doesn’t support controller emulation, and Macs simply don’t allow the Steam Link to stream. Valve has, however, stressed that this is a temporary problem, and one that it hopes to have resolved soon.
As compensation, Valve will distribute the Valve Complete Pack to anyone who has pre-purchased the controller and Link. You can still get a refund on the hardware and keep the free games, assuming you have a Mac.
Steam hardware launches at retail later this year. Stay tuned to GamingBolt for more coverage and information.