Hi Peggy and welcome to MobileRead. If you view the 300 and the 600 side-by-side, the 300 has a cleared but most Forum members who've bought the 600, say that you don't much notice it when you read on the 600.
And, while the 300 may not have a memory chip slot, the thing does hold 300 plus books. I have the 505 and got a memory chip for it early on and never have actually had to use it.
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