Absolutly! We combined pictures from WDW and DL in Feb. We had over 600 pictures on our CD. We stoped at EVERY photopass person we could find. Then we saved each image with each different background. Having over 600+ pictures along with all the bordes, characters signatures, etc was well worth the $100 CD.
On a side note though. We took the trans-atlantic cruise in May and there was still no photopass. I am not sure if they started it yet or will by that time. It was still that very annoying process of looking at your picture on a wall. After a 2 week cruise that process got VERY old!