This is really clear if you know a bit about what it’s talking about, and probably impossibly dense if you don’t. The illustrations are rather whimsical usually, rather than being useful (even for people who aren’t me and can make sense of things they’re looking at!), and there are “dialogues” at the end of each chapter which go over the previous points and basically play a bit of Devil’s advocate. They didn’t work for me because it was so artificial — obviously they wrote the dialogues entirely themselves, so it was just the questions they wanted to answer — but it might be helpful in clarifying some things for some readers.
There’s some new stuff since this revised edition came out, but it’s still a good primer on epigenetics and some of the other things that are significant when you discuss evolution (like culture). I probably wouldn’t recommend it to a layperson, but if you’re already interested, it’s a good one.