Agreed. It looks nice, but it has poor usability. I tried common things like clicking the edge of the page, scrolling on my trackpad, and using keyboard arrows, but none of them worked to scroll it.

Having to find and move a scrollbar to move the pages was not immediately intuitive.

Clicking the top corner of the page works for me, as well arrow keys (on Firefox + Linux). It did take me a bit too long to figure out though...

Interesting. The arrow keys worked for me to flip the pages. Google Chrome + OS X.