Well it turns out it did work, and pretty well. The cool thing Adobe did with this feature was use the camera RAW data, and export it as another RAW format DNG, or digital negative. The algorithm used ALL the data from the two exposures. It recovered details in all but the darkest shadows, and seamlessly blended the startrails right over the static stars. How it knew to do that without complex masking, I may never know. What I do know is that I can take this new DNG file and more fully bring my vision to reality using the rest of the filters and brushes offered in Lightroom. When you preconceive an image you would like to make, it takes time and thought to bring it to fruition. It has often been said that making of an image is a two part process. The first being the creative process. This is the process where a photographer must understand his tools enough to realize what could be done to make a successful image. At that point the photographer can free himself to experiment, and to loose ones self in the moment. It can also be that point when you can have a vision. A vision of how this image could look by the end of the second part of the process. The second part of this process is the developing process. This is done in software and it is used to finalize that vision into a polished piece of art. This new version of Lightroom is making steps to really aid photographers by saving them time and letting them focus on the vision and not on the software or time consuming processes. Nice.