Thanks for the info!
I managed to run pyfantom with Bluetooth on Mavericks (10.9) using the Fantom Drvier 1.2.0f4 from the link you gave.
This version of the Fantom driver is newer than the version shipped with the Retail EV3 sofware ISO.
I've reverted some hacks to work around the Bluetooth issues in the pyfantom repository.
If you were using those, please update to the latest version e0f3e3c72ab56b3e8d5cb7194613f06ac7cd1d67
which is basically the same as the version before the hacks.
Bluetooth support is only working for direct commands (high level commands, i.e., those with specific defined opcodes), or else raw commands which do not require a return value.
I have never managed to get the Bluetooth link to return values for arbitrary (raw) commands sent to it. If you could figure out the problem then patches to pyfantom are welcome.