I'd make sure the bluetooth connection actually works before parting with money.
There are major reliability issues with bluetooth at present, usually connected (no pun) with the ability of device A to re-discover device B if A's or B's power has been interrupted. It's a big problem with bluetooth headsets on mobile phones.
And in a plane there's a lot of radiation, from the VHF radios, DME and xponder. Lots of potential for messing up the connection.