I imported VOB files into Vegas 6 this weekend for the first time, works great!
One thing I learned however, is to rename the VOB files with another name. I imported VOB files from two different DVDs, so there were multiple copies of files with the same name. This was fine on my laptop, which I started on, but then I moved the files to my main editing PC, some of the files got mixed up, showing the wrong footage in certain points. It only added another 45 minutes to the project, but I will rename VOB files first, next time, to avoid this mess.