I've actually started reading most of my books from Google Play... What I really like about it is a) I can read the book from any of my devices connected to my Google Play account (so my phone, my Nook tablet that I converted to using an Android OS, and any computer / laptop logging into the Google Play website) and b) because I usually am carrying my phone, I can read it essentially anywhere that I am. However I've also got several books from garage sales etc. that I'll have to read out of the physical pages. Also, because they try to mimic a true sheet of paper with text, it's written with black font on a white background... If you are on your computer for long periods of time, this brightness / style can lead to eye strain; and this is made worse by looking at a small screen like a cell phone (and with printed books, it is reflected light off of the matte pages, so it doesn't cause as much eye strain as actually shining a light as in a device's screen). It'd be nice if there was a way to adjust the colors / contrast so that it isn't so harsh on my eyes. I have a tool that I use for writing computer programs, and it has a way to adjust what background and fore colors you want to use; thus I have it set to have a black background with green text on it (with the text colors changing for certain keywords, etc.).