I've finished reading "Agile Web Development with Rails 4th edition"

I've finished reading Agile Web Development with Rails 4th edition.

• Rails 3.1 is significantly different both from rails2 and from rails3.0, so that you should read it if you want to catch up latest rails.
• In this book, all samples are written with Ruby 1.9 - there is no exaggeration that Pragmatic Programmers recommend using Ruby 1.9.
• In this book, MinGW is introduced as Windows Environment - there is no exaggeration that Pragmatic Programmers recommend using MinGW .