This is a fairly new product, but I was wondering if anyone has tried it. For anyone who, like me until a few days ago, doesn't know what it is... it's a bracelet you wear that syncs with your iphone and helps you keep track of meals, calories, sleep, etc.

Has anyone tried it? And is it worth the money?

I've never heard about this either until I read your post.... I'm interested to hear if anyone has tried it too

It is not for sale right now. They launched it in November, had big problems and pulled it from the market.
I do have one and love it. Though it does have problems and hopefully they can solve it and release a new version that works reliably.
It is part pedometer, part sleep tracker. The pedometer is nice but the killer feature is the sleep tracking and especially the smart wake up function.
Keep an eye out for the re-release.
You can find more information on jawbone.com/up for now but as I said it is not for sale right now.

Awesome - thanks for the info

Ohhh, ok! Thanks a lot. That's all really helpful to know!

it's for sale now! I'm trying to decide between it and the fitbit.

Not according to jawbone. Where did you see that?