This head set does the job, it's small, cheap, and cheerful.
The sound quality is good, however the range is really bad. For instance I just having the phone a metre or more away makes the sound quality degrade and it starts to break up. Also the battery life is not the greatest and when it's getting just a little low the sound starts breaking up.
In short, it's great if you don't plan on using it for more than an a couple of 2-3 hours, moving more than 1 metre or so away from your phone, and you are able to charge it often (depending on how you use it).
It suits what I use it for, which is just for when I am driving.