That's a good review ans I pretty much agree with everything you've noted. In the short time I've used my 650 I haven't noticed the shadowing issue, it was a noticeable problem with the 600. It's interesting to see the additional contrast of the 650 against the 505, the difference is even more noticeable against the 600.
I've used my 605 this morning to catch up on the news and I have to say it's a joy to use, the page turns are very swift, requiring only a light touch with the finger and the screen readability is just so much easier with the 650 over the 600. The sun's a bit overcast in the UK today, but I've taken a quick picture of how the contrast of the 650 compares with the 600. It's not the best picture as it was taken in a rush and using my phone camera, but it shows how noticeable the difference is.
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