DVD X Copy usually requires 2 discs, but you keep dvd quality. There is no compression. DVD X Copy Xpress uses compression and only keeps the movie itself, keeping better picture quality as less compression is necessary due to the removal of menus and extras. I backed up Braveheart, which is a massive dvd, with Xpress. I was pretty impressed. The quality was that of about a good vhs. I personally stick to regular DVD X Copy so I can keep true dvd quality and the extras if I wan't them.
US V7 PS2 w/ Apple Pro
LG GCC-4480B 48X24X48X16 CD-RW/DVD-ROM Combo