So far, the data is showing that most people still prefer reading on paper versus on screen, by a decent margin (only 14% prefer screen). However, people still read more ebooks than paper books, likely due to the convenience factor. This can be squared with the NPD data because library ebooks are included in our poll, not just purchased ebooks.
I've been surprised at what small percentage of people use a monochrome Kindle (less than 25%), and the lack of a dominant platform (Amazon — 35%, OverDrive — 19%, Apple — 11%, Nook — 8%, Other — 27%). I guess it's good for consumers that there isn't one big leader here.