The 600 is a great reader! I have had mine for a couple of weeks and am totally in love with it! My hubby bought it for me as a birthday present - in the hopes that I will stop buying books as we have no space to put them! I was a bit skeptical about e-readers, as I am a bit traditional, but I love it. It's so easy to use, and I can carry around many books with me without them weighing me down.
I have an Oberon (
www.oberondesign.com) cover on order. They are more costly than the M-Edge cases but they are gorgeous. Can't wait for mine to arrive.
Have fun with your Sony!