3.5 stars.
This is the second book I have read about organic chemistry - and I must say, this one was a lot better than the first. David Klein's intent is to help readers build intuition behind the subject and he does a very good job of doing just that.
Really, the first 9 chapters of this book are very good. My only issue is with the last 4 chapters, which are unfortunately pretty useless: for whatever reason, Klein switches gears and basically says, "Well, I've taught you how to think about substitution and elimination reactions, so use these blank pages to copy down the additional mechanisms you can find in any other chemistry text and commit them to memory." It's very bizarre, especially because Klein has a gift for explaining this stuff. My theory is, he was getting sick of writing the book or maybe didn't have time for it: seriously, the last 4 chapters probably took a single weekend to write.
I may read the sequel. More of the same, I'm guessing.