On Mac, if you're using JRiver and want multiple device Airplay support a one-time purchase of Airfoil is worth it. The cost can be covered, for instance, by skipping over the next MediaCenter upgrade for Mac, and unless this feature does happen to get added then I'd say it's worth considering that as money better spent over whatever may or may not be added to MediaCenter 28 for Mac. I get the upgrades, to support JRiver, but having multiple device Airplay support is a very important feature for me and one reason I stick with JRiver for Mac and not switch to Linux- so I consider Airfoil relatively essential.