Weird UX critique. There's no 'Download Book' button. You can view a page, then click download, then click 'Select some or all pages for download', then click 'Select All' then click another 'Download' button, then you wait ... not for the download, but for them to prepare the download. As if they didn't even consider people wanting to get whole books. A 234 page PDF took about 8 minutes to prepare, and results in an 81MB file, which only takes a few seconds to download. Then you realize you're not getting full resolution images but some pre-selected resolution over which you have no control.

So somehow in the process of designing a fancy tile-based viewer for the web they completely forgot the most basic use case that all other ebook delivery systems start with.