I usually shy away from forums because of all the angry trolls, but I've read a lot on MobileRead over the past few months and everyone seems generally friendly and helpful.
CNET just posted their review of the PRS-600, and it didn't fair too well:
http://reviews.cnet.com/e-book-reade...-33743850.html
I've also got written reviews and video reviews of the PRS-300 and PRS-600 on my ebook reader website if you're interested. And a third video comparing the two.
It's all under
http://www.the-ebook-reader.com/sony-reader.html