I purchased the PRS-900 in March and have not really been using it that much lately, mostly due to the glare. I have even tried applying
an anti-glare screen protector but it doesn't seem to help much in reducing the glare. Coming from PRS-505 which has excellent contrast, I found the 900's glare to be pretty distracting, and at times, headache-inducing. This is despite having bright indoor lighting around the room or under outdoor sunlight. Yes, you can tilt the device and the glare is gone, but this means you have to hold your device at a specific angle. A very particular angle. To me, this greatly reduce the comfort factor of having a dedicated ebook reading device. Nowadays I end up doing most of my ebook readings in my phone. At least that way, I get to be in whichever position I'd like to be.
If I had the choice of which ebook device to buy now, I would go for the new Kindle DX ..
Touchscreen means nothing compared to readability. In fact, I might even sell my 900 soon and get myself the Kindle.