I have it and really like it. It talks a lot about rabbit behaviour in general, too, rather than only about behavioural problems, so I think it could be a good read even for people with bunnies who don't have any issues. The book takes the approach that most behavioural issues are caused by problems in the environment or diet or how the bunnies are treated by their humans or by unrealistic expectations that humans have of rabbits, rather than putting the blame on the bunny being 'bad', so a lot of the book talks about how to find the reason behind the behaviour, and how to create a good environment and life for bunnies, and how to communicate with them, and then the last 30 pages deal with several specific behavioural problems one by one. There's one page about overgrooming, but since you already spoke to Guen about Zigzag, that probably won't tell you anything new.