I like my PRS300.
One of the quirks is that you can't have an epub & pdf on it at the same time. I exclusively download my books from the library. One of the positives with this reader is that if you are in the middle of reading a library book, it stays on the reader until you click to the last page OR hook it up to your computer to charge. I have the optional dc charger.
I also have the leather cover protector w/built in LED light that I like. It balances in my hand in a comfortable familiar way. I'm not in any way tempted by the new stuff coming out at this point. It does what I want it to do, allows me to become immersed in a story without distractions

fits in my purse easily.