[Ea]

As far as I see it, ebook readers are still not 'good enough' especially with regard to implementation of user interface (software and hardware) and formatting of content. As well as availability of ebooks, etc. etc. We still need to reach a level where there are some common best practises that most ereaders and content can live up to.

Added: Many of the devices we see today are first-generation or 'early' in the sense that few companies have worked with ereaders for a long time and there's a lot of new players in the market who more or less tries out new things as best they can.