This is really good stuff if you got the time to burn (pun intended). Where as most transcoding software, (XCopy, CloneDVD2, DVDOne) take anywhere from 20 to 45mins to clone a DVD, DVD-Rebuilder will take on average 3 hours.
The trade off here is a VAST improvment on video quality. Where video artifacts, such as ghosting and glowing are common when using regular transcoding software, they are virtually eliminated with DVD-ReBuilder.
After the initial setup of Rebuilder, you'll find it to be just as easy and convernient as the other one click DVD cloners. The only exception is that Rebuilder requires you to 1) rip the DVD to the drive (which some of you may already to regardless) and 2) it requires roughly twice to three times the space of the DVD, due to it's inefficient method of cloning (in regards to file handling, which does not effect quality). This and it's insanely difficult setup is why I only give it a AVERAGE rating, which I'm sure will go up as the author develops the software even further.