Purchasing game disks

When a game is ordered it gives the option, for an extra cost, of a disk with the games you have ordered plus a free full version game and more trial games. What is the benefit of purchasing these disks.

I think all of mine are Rise of Atlantis that's why I wondered what the benefits were. As for playing them on other computers are you limited to the number of times you can downlaod as you are from your purchase list

I bought backup CD's for 3 of my games and they all had Rise of the Atlantis. Lucky I had 3 grandkids to give them the CD's. Never tried them on my computer to find out. Maybe can answer that question.