PEARL and OpenBook 9.0?

Has anyone used the new PEARL camera with OpenBook 9.0?  If so how well does it actually work compared with a flatbed scanner.  As far as the number of errors is concerned?  I keep finding the same information about how wonderful it is but nothing remotely independent.  Curiously with all of these camera designs I keep thinking they're missing something.  How exactly do you hold the book open?  Only the most abused hardcovers I have will actually stay open by themselves.