I was also investigating this library a couple of days back to use for my app...looks very promising.... Although I haven't had time to start implementation yet... I found the documentation much better than for any other PDF generation libraries out there....
This library is probably the most full-featured, well-documented open source PDF libraries I ever came across. Implementing it right now for a small app I'm building and it's simple & fun to use.
Can't believe it's developed by one single dev and it's MIT-licensed. Really happy this exists, as before this there were almost only paid/commercial PDF libraries in the .NET ecosystem.