I need to be able to render some views as PDFs from a Rails 3 project. I\'ve never before used PDF generation techniques with ruby/rails, so I researched a
Prawn does work with Rails 3. I have personally used it with no problems. You do have to get the latest versions of the gem and the prawnto plugin for rails.
PDFkit does have the advantage of using the Webkit rendering engine, so you get to use CSS to define your layouts, and you get matching web pages for free with Safari and Chrome. It has a slightly nicer learning curve than Prawn.