I also like the LRF format. It has a functioning Table of Contents and I have no complaints. I did just hear from another source someone complaining about wide margins, but that has to be caused by whoever formatted the ebook. Nothing about LRF format itself automatically results in wide margins.
I've heard that epub format works on Sony too. I'm still looking into this. I tried to load one on my 505 and it didn't work, but that was just one try. Probably something I did wrong.
PDF formats work OK on the Sony, but I'd buy the LRF before the PDF if it's available.
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