Ask HN: Do you know of a good 2-way Android-Mac/iTunes music sync setup?

I am fine with either a GUI or a command line tool, as long as it's fault tolerant and doesn't often breaks things.

I have tried Google Music Manager and doubleTwist and neither of them offers a 2-way sync. Anyway they leave a lot to be desired.

Even if there's not a install-and-use setup, please do guide me towards a direction where I can put together few tools and achieve it, if you can.