I'm fond of my PRS-300. I've only had it one day, but I've already gone through an entire book on it and am working through another. I only load ePub books to my Sony - most of which I converted to that format using Calibre. Calibre's ability to convert pretty much any format makes the question of format support on the device end moot, IMHO. All my ebooks were converted for the PRS-300, but I've been able to read them on my Omnia II smartphone and my latpop without any strange issues.
Perhaps you may want to look into how the particular device fits your wants/needs, and just take care of file formats on the software side?
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