Polite Paradise

I am currently hooked on the A Very Short Introduction book series. They cover a huge range of topics, and are a compact and interesting summary of each subject. However, the writing itself is widely variable as far as quality. Logical enough, I guess, seeing that so many different experts are writing about their own fields. I check them out of the library first to examine them and see if I want to buy it, and that way I don't waste any money on the ones I don't feel are written very well or which aren't what I expected them to be. I have 13 so far on my bookshelf, two I received as gifts this Christmas.

Has anyone else here read one or more of these books? What's your opinion of the series?