Nasty shortcoming...
...of Motorola's policies not the headset.
A friend has one of these and loves it. I was asking him about it, and was interested in buying one for myself.
Then the bombshell... he commented that at one point one of the rubber in-ear bits got knocked off and lost. He called Motorola to buy a replacement. They would not sell him one. His only option is to buy a whole new headset.
I wouldn't touch this thing with a 10-meter pole...