I read the reviews, both the positive and the negatives, and decided to give Jawbone a shot. I enjoyed my Jabra JX10 quite a bit for the 15 months that it worked, but to die 3 months out of warranty . . . So you can consider this a head to head comparison between the Jabra and Jawbone units.Fit and Comfort: The Jabra is clearly lighter so you can almost forget it is even on. The Jawbone is much larger and takes some work with the supplied earpieces, but in my case simply using the other earpiece that is supplied resulted in a very secure and comfortable fit. Yes, it is bigger, but for me, I can leave it on all day in comfort. Both units are quite good in this regards.Ease of use: The Jabra is somewhat more intuitive with clearly marked volume buttons vs. Jawbone's one-direction volume loop (press and the volume goes up until it reaches maximum and the next press goes to minimum). Other than this, however, the Jawbone is easy if your primary use is answering calls. Some complain that the button is 'hard' to push and pushes the Jawbone into your ear but I have had no such issues. It was immediately as natural and easy to use as the Jabra for me and I do not feel any pressure like I am impaling it into my ear! No complaints here on either unit.Sound - incoming: I rarely had any problems with the Jabra and so far the Jawbone is equal or better. If Jabra has any advantage it is with the easier volume control, although I almost always had to have it near maximum to hear when in a car. The Jawbone can get louder and I do not generally have to adjust it, but if I do the Jabra is easier. But a slight overall incoming sound edge to Jawbone.Sound - Outbound: The best for last! NO COMPARISON! I rarely had people complain with the Jabra, especially if I was in a quiet room. Then they might not know I was on a headset. But kudos to Jawbone on the active noise cancellation! As a test early on I turned up the TV volume to where I almost couldn't hear the party on the other end and they COULDN'T HEAR the TV! We held a comfortable conversation where whatever noise was going on in the background at my home was virtually inaudible on the other end! For those reviews who state that this feature doesn't work, I can only assume that a) the unit was defective, b) the noise cancellation circuit was turned off or, and this can probable be critical, c) the fit is not good and the 'vibration sensor' is not in solid contact with the cheek. In my case, with a comfortable and solid fit, the noise cancellation is almost eerie. And worth the price of a Jawbone.Overall, four stars only because the fit is indeed something that could be improved to make it easier for everyone to use this successfully. But other than that, Jawbone is the best I have ever used by far. Now, if it will last more than 15 months . . .