I have a Kindle 1 and my SO has the Sony 505. The reason I wanted the Kindle over the Sony was for the ease of downloading via whispernet. However, I have had nothing but problems connecting to whispernet. My device shows I have full connection to whispernet with all the bars showing but then when I try to access it, my device says it is "unable to connect". This seems like a problem with my Kindle. I also have had problems with my battery. I will fully charge it and then try to use it and it will shut down all of the sudden after a couple minutes of using it saying battery is too low and then it won't turn on until I plug it in. My SO has had no problems at all with the Sony. Wondering if anyone has heard of this and hope this helps others making a decision on which device to get.