I recently received Jawbone - Up as a birthday gift, and now that I've used it a month thought i'd give my opinion.
I had previously researched the Jawbone and fitbit models and considered trying 1, however since I use a Polar HRM to work out with, I never pursued it, because the thing I'm interested in most for these devices is the amount of calories i'm burning.
The Jawbone was comfortable to wear. After a couple of days I got used to wearing it, with the only complaint being that sometimes it got hung on dress shirt sleeves. I never had issues sleeping with it on, like some others i've read about. Eventually I essentially forgot it was there. I chose to remove it when showering as well. The instructions say it's OK to shower with, but I figured why take the chance.
Activating it and syncing it with my iPhone was extremely easy, and updating it however many times a day you choose is easy, launch the app and plug it into your phone it does the rest. The sleeping analysis is probably the most interesting to me, and I still could never figure out how it knows if you're awake, in light sleep or deep sleep, but it did pretty good at knowing when I was awake. I have also used a Zeo in the past to track sleep and felt like it was fairly comparible, but the Jawbone doesn't track REM like the Zeo....and well....Zeo is out of business.
When doing cardio, I decided to wear the jawbone and my HRM at the same time just to see how they compared. Initially I felt like they were comparable, but then over time I felt like the jawbone was less accurate. I will say that my cardio changes from day to day and some days the machines I use to not involve arm movements, so this may impact the accuracy. On most days, if I was walking or jogging, I felt like it was more accurate.
Over all, I think Jawbone does a nice job with the user interface, the ease of use, and it being comfortable. To me, it's a bit of a novelty as I've stopped wearing it. BUT, if I didn't own a HRM, I would probably be in love with the Jawbone. Over all I give it 4.5 out of 5 Grace faces. LOL - sorry that's a youtube reference if you aren't familiar.
