A sleek look, heart-rate features, and low price make the Alta HR perfect for casual athletes.

Slim; sleek; and unobtrusive design; Precise heart-rate tracking; Impressive activity recognition; Useful sleep-tracking data

Dim; finicky screen; Not waterproof; No manual fitness profiles or relaxation features

I have been wanting to get one of these devices for some time now but was not willing to give up my watches. I found the Fitbit to fit my right arm and not look awkward when wearing my watch on my left arm.

It's small, easy to use, and the battery holds for a great amount of time. I also like how this is a thinner model because you're able to use bracelets on the same arm as the watch.

Have had my Alta for over 1 year and am very pleased with it (less pleased that my first copy ended at the bottom of the ocean after about 1 month ...). It does its job without worrying too much about it. Registers my steps and reminds me when it's time to touch me.

Love this! Helps me keep track of everything for health & fitness! I use it everyday. Best money I've spent in a long time!

This is my 3rd upgrade in two years. I started with the Flex, then got the Charge, and finally this. This was much sleeker, and imho, more stylish. I liked that you can change the bands as the Charge was a fixed band. I am debating the bracelet band once it comes out.

This is my third fitbit. I started out with the flex and then went to the Charge HR. I am really loving this one. I only hope that it lasts more than a year or year and half. It has changeable bands, battery power lasts longer than the others did.

I bought this as a simple tracker that could sync with my phone and maybe show me some notifications. However, the tracker doesn't sync with any Windows 10 device over Bluetooth - you have to use the included dongle. This means it won't sync with a Windows 10 phone if you have one.

I ordered this a while back and have been using it for a couple of weeks. It's changing my life. I set a goal for my steps each day and always beat it. I've had trouble sleeping recently and with my Fitbit Alta it helps me track my nights. It's honestly one of the best things I've ever brought!

The hardest thing to predict about a fitness tracker when you buy it is how long you'll actually use it. Many buyers leave theirs to be forgotten in a bedside table after a few months of use.

Slim; comfortable design; Accurate heart-rate monitor; Excellent auto-recognition and recording of activities; Sleep Stages and Sleep Insights are important improvements to overall sleep data; Great battery life

No connected GPS; Not easy to see heart rate during a workout (unless heart rate is your default screen); Nighttime heart-rate data and Sleep Stages separated on two different graphs; Doesn't integrate with Apple's HealthKit