Cons> No chunk of change control on the HK shame given the price of toy, blah conference mode, it triggers you listen to music, not really a discrete receiving a call.
The jack does not allow a connection to amps.
Pea cabin for a trip a bit heavy for the aircraft, unless he travels in the hold.
Overall a good product, but suffers from a usability and a remote control of the speaker to a little over mobile ...