The Fitbit Alta is about as chic as fitness trackers come. And the equally chic Alta HR ($149.95) adds continuous heart rate monitoring and better sleep tracking to the mix in order to close the gap between it and Fitbit's more hard-core offerings.

Long battery life; More in-depth sleep tracking and insights over its predecessor; Accurate heart rate and step count readings; Slim and comfortable to wear 24/7 with plenty of band options

Screen is occasionally unresponsive; Buckle feels a bit flimsy; No altimeter; Lacks GPS

Fitbit just made the slimmest fitness band with continuous heart rate monitoring. With expanded sleep features and week-long battery life, it's a...

Up to 7 days of battery life on a single charge; Insightful sleep-tracking features; Automatic exercise tracking now includes heart rate zones

Lack of built-in or smartphone-connected GPS

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

All Images: Alex Cranz/Gizmodo Let's face it, the world of fitness trackers has sort of plateaued . Most people who want a fitness tracker already have one, and more than a few of us have old trackers shoved away in a drawer, useless because the charging cable mysteriously disappeared, or because...

I've said it before and I'll say it again: The best activity tracker is the one you'll actually wear every day, otherwise there's no point in buying one at all. Fitbit's new $150 Alta HR is the one most people would wear not just every day, but all night-and that's worth every penny.

The Alta HR is Fitbit's most stylish heart-rate tracker to date. It lacks an altimeter for stair and hill climbing stats, but its 24/7 heart-rate monitor will help you get fitter, lose weight, and better monitor your sleep.

In my youth I was a bit of a fitness fanatic, playing some sort of sport almost every day of the week from memory. This was partly because the Sega Megadrive did not have the immersive quality of the modern day 'social' consoles but also because my parents really encouraged me to keep active.

Great motivation; good value; great App

Other products have more functions

There's little denying that the Fitbit Alta HR is a reiterative product. It looks very similar to the regular Alta and a bit like a smaller Charge 2, but it sits somewhere between the two in terms of features.

Size It's small enough that it can almost go unnoticed; This isn't a Flex 2, sure, but it's less prominent than the Charge 2 and won't look weird if you wear a watch or smartwatch on your other wrist, Continuous HR monitoring The highlight feature of the Alta HR - it's in the name after all - is a...

No altimeter I don't use it often, but the option to see how many floors you've climbed is essential for many; Even the Fitbit One had an altimeter so why Fitbit keeps omitting it in some models is beyond me, No "Multi-sport It means you can't manually start an exercise from your Alta HR like you...

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.

Great to use for tracking my steps a d exercise. Didn't like the band. Purchased watch band buckle type straps to feel more secure and not lose it.