I read all three of those books, plus Ball Lightning by the same author. I found them very difficult reading, partly because I wasn't familiar with Chinese names and had trouble keeping them straight. Also, the material was dense and required a lot of background. But the ideas and some of the images stand out more than dozens of other books I've read over the time period. For each book, it took me about 3 months to get through the first 40%, then 3 days to get through the other 60%, once I had bootstrapped enough to get into them. Not easy, but highly recommended.