If you are considering this, you should do prepay for the CD with all the photos, since there is a discount vs on board. You can add the prints on board for $100, which is the same as prepay. Note that pre paying is fully refundable. I was told that if you decide to down grade to say a 10 or 20 prints, they will refund you the difference.
The 10, 20, or all prints on CD, gives you a CD with ALL the pictures. You will then be able to unlock the full resolution depending on the package you select. With any package, you will get a release allowing you to print the pictures yourself.
Note that all the prints come with borders, which makes them printing them at different sizes hard, as you will need to crop. The 6x8 size (most pictures with characters) are a pain, as you have to crop them, if you want to make them 5x7 or 4x6. I suggest you expand the canvas size to a corresponding factor and then print to the size wanted. Remember the cost of 8x10s are high, even when you print at WalMart.
Finally, if you are only considering the 10 or 20 packages, here's a trick. On board, take note of the small printed number on the actual prints. This is will be part of the filename and might help you if you cannot recognize one print from another. The problem is that prior to unlocking, the small resolution is indeed very small and hard to notice differences.