Had a PRS-505, now have a PRS-T1, never used the Sony store after the original registration. All my content is in epub, pdf, rtf, etc. all acquired from places like baenebooks.com kobo.com and my public library. Get Calibre to use as your ebook library software and it will manage your books on your computer and your Sony PRS-T3. The biggest advantage to the Sony Readers that no one mentions is the ability to sort by more than the title of the books, When you have 500+ books on the Reader, it is nice to be able to sort by series, (which the Sony calls Collections), author and date added as well as just the title.