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Reading it on a 27" 2560x1440 display was really nice. Same in vertical mode on a 9.7" iPad, but not so good in horizontal mode; it felt constricted like watching a letter-boxed 16:9 movie on a 19" 4:3 TV screen.
What I've found is that optimal text formatting varies greatly across devices. This is very hard to design for due to the variety of screens. From small screen devices like cell phones and gray-scale Kindle's, through larger 24" - 30" monitors and even larger HDTV's. On top of that there are DPI variances.
I've always been a fan of MVC, separating the model (actual document data/text/pictures) from the view (how it's displayed), and using a controller (device/screen-specific code) to display things optimally.
It would be nice if there was a standard that existed allowing authors to simply write documents, saving them as models. Then, each device could read from a standard model file and, using custom controller code, generate a view displaying the text/images optimized for its display.
Right now you see web developers creating multiple CSS layouts for different screen layouts. This works for most cases, but not edge scenarios. It feels very hacky, and I can't foresee people building websites/content-delivery-mechanisms like this 10 years into the future. There must be a better way.