It works better over USB because he's running 10 Hz; as I understand, it's much better at 5 Hz with BT?

No firmware upgrade, as far as I can tell, just changing settings. (A thought: if tz1 has the setup to record and post the exchange between the devices, it would be possible to make an expect script to accomplish the important configuration settings from Linux.

I'd be buying one, except I already blew $50 on an inferior unit a week before he posted...