I purchased by K3 as a extension to my S505. I still love my 505 and won't be parting with it anytime soon. I still have another 505 new in the box as a backup. I paid an awesome price when they were bringing out the new models. I still prefer the build quaility of the 505 and the open architecuture for the file system, epub, etc. The K3 is great for everything else, I never thought that I would use the 3G as much as I do, it is a great convenience to have. Neither device is good for PDF (IMO) but that has more to do with the PDF format then any other short comings. Although the S505 potentially can more storage the 4GB that the K3 has is enough for me and probably most users unless media other than books are consumed.
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