I had my 505 for exactly a year before I sold it. I had read many books and it was exactly what I was looking for. It made reading books so easy. However, I put it on ebay the minute I saw the 700 specifications and waited eagerly for my 700 to arrive.
I am really pleased with the 700, it is much faster and it handles PDF documents much better. It also allows larger print and has a light.
I did not even notice the screen difference when it arrived and was surprised to read it here. I just noticed it was heavier and all the new features. I am really impressed with the new unit and was quite surprised that all the upgrades were exactly what I was looking for.