The attempt to amuse with silly examples wears thin after a while. That accounts for the four stars instead of five.
I bought it because it is required for a class I am taking. It explains English grammar clearly and simply. Short chapters and large type make this a 384 page book. It's equivalent to maybe 200 pages of a regular book. We are using it with the workbook, and they complement each other well. If you are really just reviewing your grammar, you might try getting just the workbook, which does have quick explanations at the beginning of each group of worksheets. The workbook also has correct answers for all of the worksheets, with explanations of why those answers are correct.
I think I slept through grammar, which was taught somewhere in my K-12 years, because I remember very little of it and had no real knowledge of things like gerunds or dangling participles. For me the book and workbook combo are working nicely.