I'm from PrestoPhoto and I posted to LrC a few months back about a new (Mac only) workflow for creating photo books in LrC and we've had some great feedback.
We are now looking for Cloudy users to test out our software and give us some feedback as well. Using our software is completely free, including high resolution export. We offer printing services in the app, but you are not required to use them. There are a lot of unknown technical challenges we are trying to discover. For example, a recent user had 70K images (!) in their cloudy catalog which caused a refactor of our software.
If you are interested, we have short howto video for cloudy, and an intro web page. We have a technical evaluation program if you would like to review our products, and also a first time discount for Lightroom'ers. Contact our support via chat or email for details.
Thanks for reading, and I would love to hear your feedback!