100% true, DVD fab does remove the watermark, which is why I use it to back up all my DVD-A discs.DVD-Fab should work for your DVD Audio discs (I can't imagine you'd have too many).
BTW--the above poster is right. Watermarking is a tricky thing to navigate with DVD-Audio backup. I *think* DVD-Fab removes this if you use the clone disc function, but not 100% sure.
But there are problematic discs, like the Doors Perception box set that can "fool" DVD fab and you just need to keep trying different combinations of versions of DVD fab combined with different optical drives. It took me quite a while to rip that entire box set but now that I'm successful in the end I never have to worry about disc rot again.
The beauty of DVD fab is you can download a new version and try it for free for 30 days so if you can rip all your discs in 30 days it's essentially free and DVD fab does not put their own watermark on the free edition like some other software does.