My rating: 4 of 5 stars
This was suggested to me by someone as a helpful book for someone new to the language but not new to programming in general. I found this more helpful than the Pickaxe book because it’s concise with examples while being detailed in the why’s, when’s and how’s of things, which is something I’m more interested in when learning a new language.
It’s an excellent companion to the Pickaxe book since it gives a different voice and perspective on the subject. I mainly read The Well-Grounded Rubyist and then used the Pickaxe book as reference when I needed to look up something more technical.