bob4432 and ZimZum, do you use the older, freeware version, or the Pro incarnation of DVD-RB?
In my experience, I'd say DVD Shrink (latest version) was quite decent when it came to re-encoding DVDs, as long as they were not terribly complicated. Some people say DVDShrink should not go under 80%, but I've seen great results at 60%, in the case of several Paramount barebone titles which are nevertheless over 7.5 GB in size, ("An Officer and a Gentleman" comes to mind)... I mean, it's quite obvious that a movie under 2 hours, with a small, static menu, and no additional sound tracks will compress quite well to 4.5 GB...
Of course, "Deep Analysis" should ALWAYS be used...
As for ripping, my experience of over 3 years in this field has led me to believe nothing is better than DVD Decrypter, and that DVDShrink should not be used for decrypting to HD... unless you like occasional glitches and blocking in your backed-up DVD.