I don't trust a read and burn at the same time. If that's what you are thinking about.
I use DVDFAB to backup the DVD to my drive.
I then use Shrink to create an ISO image and nero to burn.
If the film is over 2hrs 30min long, I use Shrink AEC and smoothness features to give me a good picture.
Have being using Shrink and Nero for a couple of years now.
If DVDFAB can do the same as Shrink and Nero, I'll gladly go that way.
All in all, it take 45mins to backup and burn to DVD-R.