I used DVD Gold and put Brokeback Mountain on two discs. No glitches and the quality is great. This was the full screen version that a friend bought. He will be using the film a lot and wanted a back up. I have the wide screen version ordered and will put it on two discs for back up also.
I only buy wide screen versions. I figure that sometime in the future I'll be buying a wide screen TV and want my movies in that format. If a movie is filmed in wide screen and you get the full screen version you'll be losing about 50% of the visual information. With some films you'll be missing crucial information that the director wants you to see. In the extras for Flightplan the director shows what happens to his films that are formatted to pan and scan.
I suggest that when learning how to copy DVD movies that one first copy to a hard drive. Check out the copy there for problems and then copy from the hard drive to blank disc(s). Use good quality blankd discs. Get some RW to work with at first. Yes, you'll be spending a lot of time BUT it's time well spent on learning how to do thing right. Be aware that serial discs are a problem and always copy then to the hard drive first until you have a copy that works.