Had 3 pieces UP24 for 2 years and complained last due to battery problems this year. Then got on the warranty replacement of a UP2.
What I liked with UP24 was the fact that you could easily throw at you a tape to which the UP2 keep on tightening it.
UP2 will automatically detect when you are active, ie counting steps and when you went to bed you down strap into sleep mode automatically. This requires that you have approximately 250 steps or been stationary for 2.5 hours.
If you want to avoid the band will work automatically, you can switch to sleep mode via the app. Takes a few seconds for the app to convert, and then vibrating belt.
With the UP24 was just holding the button on the side of the band for a few seconds until it vibrated as it was for from being active and count the steps to be in sleep mode.
Battery life between 9-10 days.
Prefer UP24 UP2 before, although the former is unfortunately expired and had much trouble eg battery and the button that stops working.
UP24 was much easier to adjust. Unlike that one can not put down the tape without having to think that it will switch to sleep mode automatically, this applies UP2. Therefore UP24 better in the sense that it does not count steps or sleep if you put down your band. Moreover, it was about pushing a button on a second band to adjust. Much smoother.
UP2 detachment unfortunately sometimes. This happened when I sleep, which I was bothering me, because it suddenly does not fulfill its proper function when the band is on the other side of the bed and not around my wrist.
Recommend UP24 UP2 before, despite my problems I had with UP24.
Liked my UP2 mostly
Like that you can put what you have eaten through, for example lifesum
If exercised through cycling, swimming lr what almost directly in the app on your mobile lr via eg Runkeeper
There are other apps that work together with the jawbone
What was not good is
Sometimes it did not register the data when you had bad reception, was abroad and did not have access to anything good wi-fi, but that was tough at times and better times and did not want to run the mobile surfing. As registered it is not always any data at all or they registered the only part.
Even the "Find My-up" displays the wrong place where it registered last, since it shows the home address, but I never found myself there when I dropped it
The lock of the bracelet was not really good, noticed a few times that the lock was about to open in the end after a corporate use type around the clock dropped it without noticing the presence until after a while.
But will buy a new jawbone again when next salary will