Apple does not list the RAM because the way they use the RAM causes it to seem like more. Vendors have a tendency to find buzz specs and then slap components in without a whole lot of effort. Apple tunes all of the components for the most effective operation within their price restraints. Most of the reviewers felt that the iPad 2 was impressive, even though it turned out it only had 512 RAM on teardown.
Specs are OK, but it is like car engines. Everyone looks at peak HP, but it is more important to observe where the peak HP comes in at, and how much torque it has. My brother has a Honda Ridgeback that he tows with. The V6 is rated about the same as my Dakota, but when he tows, he has to run around 5000+ rpm, while I run about 3000 rpm towing. It is not a pleasant thing to haul any distance with the engine wound that tight.