Having looked for a bluetooth speaker phone to use with my iPhone, I did research everything I could find. The reviews of the Jabra SP5050 were excellent on the whole, but I was naturally suspicious as things are often not as good as advertsied.  I wanted to use the speaker phone in a convertible Mustang, and thought that the noise with the roof up (the Mustang isn't exactly a quiet car!) may make the unit less than useful. Quite the contrary. I can not only use the Jabra with the roof up, but also with the roof down - and at speeds up to about 45-50mph. Very impressive.