Not really happy at all. The light lens just adds too much diffusion so that the net effect is much less than I would like in sharpness. I am coming to PaperWhite from a Sony PRS-T1 and the Kindle just has less perceived sharpness. I have used Kindles in the past and they always seemed sharper than the Sony but were just too big and bulky for me. The PaperWhite is smaller and I had high hopes but I am rather disappointed.
And the battery life on the PaperWhite appears to be MUCH less than the Sony!!!!