Good news: yes, it's Yosemite-friendly. Created about 3 dozen ringtones and txt alerts. App moved each into the correct iTunes spot, and all transferred over via sync to the iPhone 6 Plus withOUT hassles. Sound is fine, although I suspect that's dependent on the quality going in. Last point-- I did take a previous poster's advice-- just did one tune at a time. Personal opinion: def worth the two bucks. A steal actually, given the amount of time it saves.