I wanted one for the holidays but I am having a hard time decided which one I want. It seems the way they split the wrist or clip models is a little weird. I am thinking about either the flex or the "one". Does anyone here have one already?

To be honest, I didn't know what this was so I had to look it up. It's an activity tracker! That's pretty handy. It goes beyond the usual pedometer that only measures your steps.

Is that like the Jawbone Up? I have this: http://www.amazon.com/UP-Jawbone-Med.../dp/B00A17IAO0
It has a pedometer and tracks sleep and counts calories and food via syncing with myfitnesspal

I actually tried to order it online through their website and they do not even bother to tell you until you go to process the order and checkout that they are completely sold out and everything is on back-order. I went to Target and got the Fitbit Force, it was the very last one. I have no idea how to work it yet but I will have it figured out in no time (I hope).

They aren't hard to figure out thankfully. I have the Fitbit One and I love it. It has completely changed my life and my outlook on fitness and activity. I do so much more than I used to now.

I went ahead and found the Force at a local store so I got it on Friday. I have had a few random errors, like it tells me it will not sync to Facebook but yet it does post there for the weekly stats. I also had an issue over the weekend where it told me the wrong time 2 days in, somehow I managed to be 40 minutes in the future. Everything else works pretty good (so far).

I really want something that tracks my heart rate and calories. I had the Nike band and really didn't work for me, if I was just running yes it would be perfect but no heart rate so on the bike or doing home exercises I had zero calculations on the band.

That is my issue now with the Fitbit but I can still track biking on Endomondo thankfully. I looked at a few of the heart rate monitors but I am sticking with this for right now. The only one I could currently use on my phone is Zephyr and I am waiting to see if any others come out that will work with a Windows Phone.