Well, this is considered a masterpiece if you are into biological machine learning.
The book does indeed cover the subject pretty well, in particular HMMs and profile HMMs.
Subjects are treated well and are often represented graphically too. Despite this, I think it would be better to have more examples (there are indeed very few of them).
It might be kinda hard for those who DON'T have a strong math/statistics background, since it does cover them in a couple of pages and assumes you know much about probability and stuff.