Great question! The CycleOps Joule 2.0 power meter is indeed a rebranded version of a more expensive model, specifically the PowerTap G3. However, it's worth noting that PowerTap is a sister company of CycleOps under the same parent company, Saris. This means that while the Joule 2.0 is essentially the same as the PowerTap G3, there's a certain level of expertise and reliability that comes with the PowerTap name.
As for improvements over the competition, the Joule 2.0 offers a few unique features that set it apart. For one, it has a dual-leg pedal compatible configuration, which allows for independent monitoring of power output for both legs. This can be incredibly useful for identifying any power imbalances and addressing them through targeted strength training. Additionally, the Joule 2.0 has a highly customizable data display, allowing you to configure it to show only the information that's most important to you during a ride.
As for the price point, it's true that the Joule 2.0 is priced similarly to the Stages Power Meter and the 4iiii Precision. However, it's worth considering that the Joule 2.0 includes both power meter and head unit, while the Stages and 4iiii meters do not. This can add to the overall cost of those systems if you don't already have a compatible head unit.
Ultimately, whether or not the CycleOps name is worth the premium is a matter of personal preference. It's important to consider your specific needs and budget when choosing a power meter, and to do your research to determine which one is the best fit for you.