I have a cochlear implant and I've had several of these audio induction loop tidbits for my CI processor (hearing aid) for years. In my opinion, the wire is a PITA and attracts a lot of attention.

This spring, Advanced Bionics is coming out with a bluetooth-enabled CI processor so that I finally can be able to listen to music on my smartphone via bluetooth without having to deal with wires. I've already got the money waiting to reserve myself one of these processors.