Well, it works fine this end, not crap, as far as I'm concerned ... have used it on dozens of films, without a problem.
When you say it only ptoduces a few .vob files, it sounds as though the program is not finishing properly, as it writes the VIDEO_TS.ifo/.bup & VTS.ifo's at the end of the process.
If the demo works, but the full version doesn't, there must be a problem with your setup somewhere.
What are your specs ? i.e processor/ram/HDD etc., as from what you say about the demo working ok (shorter output), I wonder if your PC is short on resources or Hard Disk space.