The Sony's can use ePub and LRF. Have you checked out all the free ebooks on MR? In the blue bar, up on the left. The drop down menu allows you to view the format you choose.
I have the Sony 505 with ADE and Reader Library 3.1 installed.
I purchased a book at smashwords.com in LRF and ePub.
The ePub opens right away. The LRF takes a second to "format". After that they both are the same speed for page turns for me.
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