Today also marks the retail release of yet another fitness device Today also marks the retail release of yet another fitness device: Up, by Jawbone. While most of you know the Jawbone brand from its highly stylized Bluetooth earpieces, the company has branched out recently with its well-received Jambox portable speaker EL8600. The Up fitness wristband is meant to be worn 24-hours per day, every day. Like the Fitbit, Up includes an accelerometer that tracks your movement in order to give an estimate of your calories burned. It also features a sleep measurement mode that continuously measures your sleep cycle. However, unlike the Fitbit, Up can vibrate your wrist at just the right moment so that you awake feeling refreshed and ready to start the day. Or at least that's the claim. Up is also very much post-PC C5-03-TV, meaning it connects directly to the iPhone's headphone jack to synch with a free app. Question is: is it worth $99 given all the competition?