Fitbit

I don't have one but looking at the features I'm getting the Charge HR.

look for reviews on it also. I'm an avid review shopper.

I have a Flex. I've had it for over a year.

Pros
I like that it is mostly waterproof (but I still take it off to shower)
I like that you can get different colored bands.
I like that it give me an idea of what my calories burned in a day are - I know it's not perfect but it's interesting and helpful.
The blinking lights are just enough to tell me how far I am form my goal without being annoying.
The Android app is great when I want to see stats (It does drain your battery a bit though)

Cons
I don't like that it's not 100% accurate at calorie counts but I don;t think anything is.
Occasionally the battery will die I get an e-mail telling me it's low, but if I forget it'll just die and it takes a bit to charge so you lose a lot of data that was sometimes.
It takes 2+ hours to charge so if you're not sitting doing nothing while it changes you lose data.
If your wrist is stable while walking like when you're pushing a shopping cart or stroller (or sometimes if you're holding onto your purse or carrying a drink) it doesn't count all your steps.

Overall I like it. For the $$ I think it's a good buy.

The Fitbit site told me that the Charge HR hasn't come out yet. I gave them my email so that I can be notified when it comes out. I'm dying to get it. But I think you'll have to wait a bit longer to find someone who has one who has used it long enough to tell you if it's good or not...

I've had different fitbits over the years and I like them. They keep coming out with new better ones.

My wife has had her Charge HR for about a week now. Seems to work well, no complaints. Heart Rate monitor is consistent with her results from Polar FT4. Battery charge lasts 4-5 days.

I was given a Flex for Christmas. I like it. I use it with the iOS app as well as the website. I like being able to see my progress during the day. A few of things:

1) I walk for exercise and use Mapmyfitness to track that. I don't use Fitbit to track it.
2) I sync Fitbit to MyFitnessPal and I sync MyFitnessPal and Mapmyfitness. This means that my steps for the walk I did on Mapmyfitness sync. I can see my steps on Mapmyfitness. I don't have things double-counting.
3) I have a calendar item to charge my Fitbit every 5 days. I do it while I'm sitting at the computer in the evening. Yes, it takes 2.5+ hours to charge, and I lose data, but not enough to worry me. I don't get the low battery warnings by doing this.
4) I'm not convinced that the calories from exercise from the Fitbit to Myfitnesspal are accurate. I'm trying hard not to eat these back for that reason. These would be the ones in addition to my walking I do with Mapmyfitness.
5) I haven't worn a watch consistently for years. Given that, now that I have something on my wrist, I keep looking at it for the time. This was a gift, which I'm grateful for since I'd still be procrastinating on getting one, but given what I know now, I'd probably spend the extra and get a Charge that shows the time.
6) #5 not withstanding, being able to swap out bands is nice. (I haven't looked to see if you can do that for the Charge.)
7) Since I use the iOS app, I have bluetooth turned on my phone all the time. I no longer have to remember to turn it on when I get in the car. It's an advantage I didn't expect.

For what it does, I think it's well-worth the price, especially combined with a mobile app.

I had a Fitbit flex, force, and now the surge. I love the devices. As stated they're not 100 percent accurate, they are not waterproof, and you do need to remember to charge them... but If you like seeing numbers to help you along I highly encourage the investment. I am by no means a runner... or even a regular gym-goer. However, I was surprised to discover that despite being overweight, I was easily hitting my 10k steps at work each day. This told me that I needed to push a little harder, set goals a little higher, and totally take a long hard look at my diet.

The other benefits besides being encouraged by numbers is that there are social features, challenges, badges (another big motivator for me, since I love achievements) and data over time to look at. I chose the Surge because I generally get my exercise from elliptical, bike, and weights as opposed to just steps. I also wanted to not have to wear a heartrate monitor seperately from my Fitbit.

Hope that helps, and good luck.

The flex did not do those things, which is why I upgraded to the Surge. The device is preprogrammed to recongize several different workouts including elliptical and weights. It also does heartrate 24/7 if you wish, or only during workouts if that is your preference. There is also a GPS feature, but I don't use it as I'm not an outdoor runner. I find the heartrate to be fairly accurate for me. There were some complaints early on that it wasn't... but fitbit released an update to correct that. However, I do not actually eat back the calories burned, so truly, I personally only use it for informations sake.

I find the fitbit flex too unreliable with the step count. I know for a fact that it counts steps when I am sitting down.