At some point I've owned nearly every Kindle model and used nearly every Kindle app. It seems to me that Amazon doesn't have the various development teams communicate well with one another. Nearly every Kindle and Kindle app has inconsistencies with the others. The feature sets and interfaces should be as similar as possible, at least as far as the current generation of Kindles is concerned, but they are not even close in many cases. Amazon still has not fully implemented KF8 across all current Kindles and Kindle apps, and it was announced nearly a year ago! Amazon still hasn't fully implemented Personal Documents via the cloud across all current Kindles and Kindle apps. This too was announced nearly a year ago, yet it remains buggy as hell or simply no implemented in some cases. As I've said before, I would much prefer Amazon to take a year off from releasing new Kindles and instead concentrate on making the existing Kindles and Kindle apps less buggy, more consistent, and finally deliver all the damn features they promised BEFORE they introduce the next generation.

The Amazon store selection, Kindles, and Kindle apps remain the best option for eBooks IMO. But I think Amazon is not properly following through promised innovations. Worse yet, Amazon seems to have no regard for the simple development rule of NEVER deleting features. Deleting features is the quickest way to anger long time customers.