"Great reading experience, but not without problems"3.5 starson by voland1935
Pros: Great design - light, ergonomic, easy to use controls, user-friendly software
Easy to read - great contrast, almost no glare
Cons: Fairly frequent spontaneous reboots - especially during travel
Lack of graceful handling of those reboots
Keyboard does not include numbers - my one usability complaint
No "lock key" feature for input controls
Summary: I really like this generation of Kindle. I find it easy to use, easy to get immersed in reading, just like with a regular book. The contrast is great - make reading easy on the eyes. My only wish would be to have the option of selecting a different shade for the background - to make it even closer to the book page look-and-feel.
My main gripe are the restarts, which is why I took off 1.5 stars. Half of that for the fact that restarts happen more frequently that I think is reasonable to expect. Another half is for how these restarts are handled (or not, to be exact). If I successfully shut down in the middle of reading the book and Kindle subsequently reboots, I lose my place in the book, unless I explicitly add a bookmark. That's just poor design. I suspect that is due to the fact that power-down is actually more of a sleep mode. I get most restarts when I travel, so I imagine there is some motion vulnerability there. But the restarts would be much less annoying if the spot was not lost - and that is a software problem, in my opinion. I hope future firmware fixes it, but since the main reason I bought this device is that I don't have to carry around books, it's a serious nag for otherwise very cool and useful gadget.