Trust me, speed is important if you're burning several copies a day every day ... If you're only copying a movie here and there, it may not matter to you ... Personally, I find that 20 minutes to make a copy is too long as it is with X Copy, let alone over an hour for Shrink to do it ...
As for quality, DVD X Copy Xpress looks just as good to me on my HDTV except takes less than 1/2 the time and is much easier to use to boot ...
Sorry, didn't realize you were talking about mass quantity burning.