Gear Diary gives their initial impressions:
This thing is thin. The Amazon Kindle trounces it in the wireless department (you’ll need a cable and a Windows XP or better machine to load books to the Sony) and the Kindle is $40 cheaper than Sony and has books for $2 less. Did I mention this Sony is thin and stylish? Having used the Kindle’s electronic delivery, I wouldn’t buy another reader without it. Add in some wireless to the Sony, and I’m in!While I love the size of the Sony, I agree -- I would only buy a Kindle at this point to get the cellular connectivity. If a manufacturer would come out with a cellular equipped eBook that can read PDF files with decent resolution (1024 x 768 and 16-color greyscale?), they'd have my business in a heartbeat. I wish Amazon would market both their digital books and wireless business model to other manufacturers of eBook readers like Sony and really get some innovation going.