Hi, happy to help.
I'm using it with a PC via the optical output so it should be fine with a Mac or even TV as there are no software or drivers involved. It's the only LDAC transmitter I have found and I must say, it works very well - very clear and fantastic quality audio, long range, easy to use, the volume control is handy, and the app is pretty good. It doesn't come with a power supply so you'll need a decent standard phone charger to use it (I had some noise pickup when plugging it into the PC). The pause/play/etc. gestures don't work as there are no drivers so neither the BTA30 nor the computer know about the headphones but volume does work and tapping the space bar usually pauses whatever is playing. There are no down-sides that I can think of, other than it taking up a little bit of space.
That said, although it has always worked perfectly with my XM4 headphones, I bought some earbuds (XM4, replaced by Sennheiser TW2 for their better sound quality) and had a few problems with connecting, disconnects and earbud resets with both. support@fiio.com replies in Chinese but I have an English language address that responds if you need it. I haven't had time to sort it out yet and suspect that my BTA30 may be faulty but they seemed helpful.
Good luck with it and let us know what you think, more opinions are always helpful.
Just in case anyone from Sony is reading, why don't you make a similar device? It seems odd to have such a good but proprietary codec and excellent headphones then not offer anything (other than Android phones and a few other devices) that supports it. A simple dongle would encourage many more people to buy these fantastic headphones.
