Jawbone Up24 review:

A great fitness tracker with style and comfort

Still, if you're looking for a serious scientific dietary- and exercise-tracking system here, the Up24 isn't what you seek. For instance, there's no way to parse your personal performance in terms of all Up users, those in your age, sex, weight class, and so on. The Up24 also does not link to fancy Wi-Fi scales to provide real-time weight, BMI, and percentage of body fat data. For that, you'll have to either jump on the Fitbit or Withings systems, which lean on the Aria and Body Scale, respectively.

Counting sheep is right in the Up24's wheelhouse, though. Like its predecessor, the wristband can log the length and quality of your sleep and report back with plenty of detailed stats. For example, you'll see how many times you woke during the night, how much light or deep slumber you had, and how quickly you nodded off into dreamland.

Jawbone Up24
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Get detailed stats on how well you sleep or add sleep info later if you forget to log it. Brian Bennett/CNET

The Up and Up24 cleverly make use of a built-in haptic feedback and sleep awareness engine, as well. A silent alarm lets you schedule alarm times, when the Up will discreetly buzz to gently nudge you awake. It's a feature that the Fitbit Force matches, but one that the FuelBand SE lacks. What's more, Up users can command their bands to wake them up from short "power naps" using a special short sleep mode. I especially like the idle alert wherein the device will vibrate when you've been sitting on your bum for too long.

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Bluetooth was sorely needed on the original Up. Josh Miller/CNET

It's better with Bluetooth
The big improvement the Jawbone Up24 has over the original Up is wireless Bluetooth syncing. It's a capability I really wish the original Up offered, and it makes all the difference. It also puts the Up24 on par with all of today's compelling fitness gadgets including Fitbit's entire lineup (Zip, Flex, and Force), the Nike FuelBand SE, and the Basis B1 Band.

More, Bluetooth is the driving force behind many of the Up24's advanced features. Paired with a new Up 3.0 mobile app, the Up24 keeps a running tally of short-term progress, which Jawbone refers to as streaks. Essentially, when you hit your daily goal three, five, or seven days in a row, the application rewards you with praise. The app will acknowledge bigger accomplishments, too, termed Milestones, such as when you hit 1 million steps or other impressive long-term feats.

Since the Up24 stays in constant communication with its paired mobile app and pays attention to your behavior 24-7, Jawbone says that after about a week of wearing the gizmo, you should begin seeing tailor-made advice. For example a "Today, I will" message will prod you to drink more water or get to bed earlier if the Up24 thinks you're slacking in those areas. In my case it took a few days longer for these sort of personalized alerts to appear, but they did happen.

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The iOS and Android apps have a lot of features and are easy to use. Josh Miller/CNET

Other motivational tools in the Up24's arsenal are ways to connect with other Up users, see their progress in relation to you, and get relevant alerts pushed to your phone. You also can log your mood and express feelings to pin to friends' accomplishments and updates.

Android users now have a reason to cheer too. Jawbone has delivered on its promise to provide support for its newfangled Up 3.0 mobile app on Android phones. Originally the Up24 and companion software were only available for iOS.

Jawbone Up24
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A new activity view compiles recent info in one spot. The app also praises you for streaks in meeting your goals. Brian Bennett/CNET

Life with the Up24
Giving the Up24 a spin on both an iPhone 5C and Samsung Galaxy Note 3 test device was frankly a joy. Even though Jawbone was kind enough to provide me with a prerelease version of the Up 3.0 application, it was immediately clear that a lot of time and effort went into crafting this software experience. A stark contrast to the Fitbug Orb application, Up 3.0 is clean, runs smoothly, and is intuitive. Most critically, especially on the iPhone 5C's small screen, application items are large, color-coordinated, and often stamped with simple-to-digest symbols.

Setting up the Up24 was a cinch, and I linked the gadget to my handsets in seconds. The app clearly reports my percentage progress on my two main goals: sleep and steps (purple and orange up arrows). If I wanted to log food, that would be laid out on the right with a handy calorie total.

Pulling down displays my "recent activities," which is a timeline of Up events like sleep, steps, and meals. Below is the primary news feed where I could see what my other Up friends, or "Team," have been doing. Swiping left reveals numerous personal stats such as goals, Lifeline, and Trends. Here, too, is a listing, called an "app gallery," for third-party apps the Up system supports.

Sliding my finger to the right of the home page pulls up deeper Up band settings such as initiating Sleep Mode (also done by holding down the Up's button for a few seconds), Power Nap, Smart Sleep Alarms (silent alarms), and idle mode.

Jawbone claims that you can expect seven days of use on a single charge. Though I have yet to use the Up24 for a full week, it appeared to be on the road to fulfilling that promise. Indeed, I'd expect nothing less from a 24-hour multiple-day fitness tracker that would match the performance from competing devices such as the Fitbit Force and Basis Band.

With its light and comfortable design, strong water- and sweat-resistant coating, plus lots of ways to help you master your sleep, not to mention nudge you toward being more active, the $149.99 Jawbone Up24 is no doubt one of the best fitness-trackers you can buy.

Originally, I felt the lack of a display was a big deficiency, especially when the less expensive Fitbit Force managed to squeeze in a small but alphanumeric display that's capable of showing basic tracking stats. But after using the Up24 over several months -- and thanks to the gadget's extremely intuitive and beautifully designed mobile app -- I have (mostly) made peace with the fact that the Up24 has no screen. With the addition of Android support (and the unfortunate recall snafu that has stricken the Force), I must recommend the Up24 just to health-conscious smartphone owners for now, at least until Fitbit rectifies the issue.

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