By some fortunate accident, I was one of the first users of the CycleOps Joule 2.0 ANT+ computer. Overall I have been enjoying the computer. The display is large and allows the user to monitor multiple ride metrics simultaneously. The rechargeable batteries and USB 2.0 download and charging is convenient, especially compares to the Cervo's cranky proprietary USB cradle/docking station. While the Joule is compatible with any ANT+ compatible power monitoring systems, I can't help but compare this computer to the Cervo, the iconic yellow computer that comes stock with a PowerTap system
It becomes your job to figure out what YOU want the display to look like (recently, Adam Myerson made fun of my setup and changed the locations of several indicators).
You can figure out how to perform most functions, such as zeroing the PowerTap without consulting the owner's manual. You can easily program the computer to work with multiple Power monitoring systems. For instance, you could ride your SRM equipped road bike in the morning and then swap the computer over to your PowerTap equipped cross bike and change the sensor that the computer is reading in under a minute.
It's fairly easy to check on interval power and heart rate. In short, you no longer have to wait until you get home to start geeking out over the data.
It doesn't bother me when riding, but it irritates me while transporting the bike.