Review from user : I just received my Sony 900 and Kindle readers BC currently own my DX. I have to go back Sony PRS 600 within 2 days of purchase from bestbuy (frozen screen, sd card not recognized, hit the reader more often). Being a software developer needs more reference books where I can use it on both my development notebook and ebook reader. Yes with Sony PRS 900BC I love reading as fun without the PDF compatibility problems? S between the notebook and the reader. I do not worry about the other features of the Sony reader such as MP3, Slide Show, and the image but it certainly wants a fast phase and a stable reading ability to scan through the pages of books 1500 developers. Yes again out done Sony Kindle 900BC DX. With Kindle-DX, the ability Navigating very slow, can not resize a PDF? S, the book list is now also in the Kindle formatted DX and can not use the light version of ebooks on my notebook. with sony navigation fater, can change the size of PDF? s, Highlighting, Bookmarking, notes can be done only with the touch of a Sony 900