You can’t accuse Jawbone of taking shortcuts with its fitness wearables. The company prematurely pulled the plug on the original 2011 UP and took it back to the lab to work on battery and stability for a year before the 2012 version was released, and it’s taken another twelve months for Jawbone to settle on a wireless implementation it’s happy with. The Jawbone UP24 is the culmination of those efforts, now toting Bluetooth LE for real-time exercise and sleep updates on your iOS device. Meanwhile, Jawbone also has UP 3.0 ready for release, the latest version of its iPhone app, and which will also work with the existing UP (which stays on sale, too), so is the UP24 worth the upgrade? Read on for our review.