And wasted a lot of money. They either are not clear, not consistent, or the battery begins to degrade quickly. I got a Jawbone well over a year ago, and it has been the best I have tried. The one issue I have with it is that the little rubber "strip" that fits on the earclip is kind of weird - loose, does not stay tight, etc. However, that is a minor inconvienence given how well the unit works, and I have been on day-long airport treks, and never once has the unit gone completely discharged. In fact, the only time that I discharged the battery was when I forgot the charger and used it 3 days! ^