Absolutely not satisfied

+ Buttonless touch function makes the headset for me unusable. Touch functions are very confusing, not clear Benutzführung and feedback. Touch functions such as accidentally triggered when inserting the headset in the ear, if just a call this is done rejected.

+ Headset loses regularly pairing or goes into sleep mode. Even if the headset is right next to my BlackBerry, it loses the connection. If a call comes in, it rarely works via "Touch" to activate the pairing again.

+ Only short distance to my BlackBerry possible after 1.5 meters begins to rustle the headset.

I'm generally an avid Plantronics user. I now possess more than two years the M100 Plantronics, make calls professionally every day at least. Two hours and am very satisfied.
The M55 in contrast is not available for me. The headset is too overloaded to functions (touch) the no clear operating concept (feedback) have, thus enabling operating errors for me. Too bad, less is more.

Unfortunately, I have already disposed of the packing and it can not return.