Not good.

It has a fuzzy display which reminds me of old applications. While it does stitch VOBs together, the resulting mpeg is not compatible with a lot of other programs - not with video editors, or as others have pointed out, not with Quicktime either. It wrecks the timecode and does somethig funny to the resolution as well. There are no options for processing the resulting file. Save your money. I wasted mine.

Joe Milo about VOBMerge