I received my 505 as a gift in December 2009 and it continues to do what it does very well. I charge it and change books every other Sunday. I read, on average, about 3 hours a day on it and the length of the battery hold charge doesn't seem to have gone down any yet.
Every time something new comes out, I want to get it, but since the 505 is still going strong, I haven't found a really good reason to replace it. I am watching the T1 though.
