I love my Jawbone! I use the alarm setting in the morning and I have to say waking up to a light vibration rather than a screaming alarm is so much better. I also like being able to track my sleep, steps and food. I have always been really bad at keeping a food journal, but for some reason this one is a little easier for me to keep. Also, if you have friends with the Jawbone they can be on your team and you can keep eachother accountable.
I say all that to say that you should do your research and purchase the one that you think will benefit you most. None of these items are cheap, so invest in the one that will give you the best return.