I can't tell you about Sony but I can tell you my case. I have a Cybook (Mobipocket) and an iPhone (ePub without DRM) that I use according to the day (weekends, for example, iPhone, which always is at the bag). So, as you can see, if I buy for Cybook I couldn't read them at my iPhone. Besides, some books are only at DRM-ed ePub. And publishers usually make a poor edition (no cover, for example). Finally, and most important for me, I don't trust on having my books bounded to a remote server or codification that I don't know when it's going to die. So, I buy them at the cheapest format I can strip DRM (preferably Microsoft reader, because it converts better), I strip DRM, edit the file to get the look I want and create Mobipocket with Mobipocket Creator, and Microsoft Reader and ePUB with Calibre. The longest task: editing the file. The others? About two minutes in a book (and automatic with only some small data in a file).
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