Not to use 15

First of all: does not bother me about the voice quality of the unit. What bothers me is the service and the slowness of the device.
It takes far too long until the device is turned on and connected until that happened, has the opposite launched again. It lacks a simple "on / off" control and no ill-considered one-button-press-hold-but-just-a-certain-period-long-hold solution.
One should not use a single head with so many features, otherwise confuses the users but only Samsung!
Successor, with whom I am finally satisfied by the way the - even cheaper - ML20 Plantronics.