I actually don't think your post is mean. Instead of improving existing products, I think Sony rather likes to sell new products. There are some improvements from product to product, even though these are not the biggest steps they could take (from a software point of view). But still, looking at the improvements in pdf support from the 505 to the 600, I think they are doing quite well. A lot of other companies still struggle with the so called "portable document format". Epub and such is nice, but pdf has been on the market for so long and has set standards everyone uses. So why is pdf so poorly implemented.
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