Reddit reviews Unity 4.x Game Development by Example Beginner's Guide

It depends on what you're looking for, really.

If you're just starting out, this is pretty fantastic. It primarily uses UnityScript but has a C# reference at the end of each chapter. I had a lot of fun starting with UnityScript and then porting the code to C# before checking it against the end reference.

I know, I know, and I am starting to work through this book:
http://www.amazon.com/gp/product/1849695261/ref=pe_226970_122930260_em_r_ti

I had an idea and figured I would try to do it.

I have read this

http://www.amazon.com/gp/aw/d/1849695261?pc_redir=1410434094&robot_redir=1

And I think it's a great introduction to Unity