Full native support. Version 6.0.5 runs flawlessly with working audio drivers.
Apple’s official stance is that you can use their loops and sounds for your own commercial music royalty-free, though you cannot sell the loops themselves as standalone samples. How to AVOID Copyright Claims (when using Apple Loops) garageband 605 download top
It does not have the seamless iCloud integration that allows you to start a project on an iPad and finish it on a Mac easily. Verdict Full native support