I have just bought the JBL's Reference Series 610 Bluetooth Headphones. It came with a small Bluetooth transmitter for the iPod, very much like an FM transmitter. The radio link is OK within 15-20 feet of range. However, when the link is broken, it takes a few seconds to re-establish. I am not happy with this, since other products can auto link in less than a second. My biggest concern is this $199 headphone has poor audio performance. There is air leakage at the bottom of both ear cups. This results in significant loss of sound pressure, low bass resonance, and clarity. I am very disappointed by the design. After all, sound quality is the primary thing. I mean, I paid $199 so I am supposed to get the sound quality at least better than a $39.95 Sennheiser wired headphones, right?