I got my headset yesterday and so far, so good. The sound quality is good; I can hear well and people have no complaints about my talking. The previous reviewer warned about how hard it can be hanging it on the ear and that part will take getting used to. I expect to have to say to callers "Hold on a moment while I put on my headset." But it can go on either side of the head, which is good. The on/off button on the cable works. The volume control works.
An even better payoff is that although I got this one to be compatible specifically with my Motorola cell phone, it also works fine with my aged Lucent cordless handset, and I wanted a new headset for that too. This is inexpensive enough so I've just ordered a second headset so I can keep one attached to my old cordless at home and have one to travel with my cell phone.
I've given it only 4 stars because I haven't had it long enough to see how well it survives wear and tear. However, it's off to a good start.