I agree wholeheartedly. The app is unusable and unstable. I had to delete collections from the web because they were getting corrupted in the app.

One thing I notice is that it simply does not render many code snippets well, especially when using the "page" (vs "continuous" scrolling). I don't get the impression they are doing QA on rendering quality. Not only external publishers, but O'Reilly books themselves! I also had a lot of problems reading Manning books in their app.

Rendering e-books properly is a pretty big table-stake thing.