I loved my 505 --- finally gave it up to my sister this past summer because I had recently purchased both a Kindle 3 and a Sony PRS-350. I replaced the battery after 2½ years and it ran like new. The ergonomics of the thing were ideal for one-handed reading and page-turning. The 505 reminds me a bit of the twin rovers on Mars or the Energizer Bunny --- it keeps going and going and going...