This book intertwines the physics and the mathematics of basic diffusion phenomena within a biology setting in a very well balanced manner. As such, it may appeal to the biology/biochemistry/biophysics student interested in the role of diffusion phenomena in biology, including chemotaxis and bacterial motility. No doubt this little book has its value. Howard Berg is an authority in the subject, a member of learned societies, and teaches at Harvard.
However, I found the book a little meagre for its price. You can find similar material intended for the same audience for free on the internet. Moreover---perhaps due to its age, most probably deliberately---, the text does not discuss the role of stochasticity in biology in general, an important topic in modern molecular and cell biology. Definitely does not worth the dollars. I read an exemplar from the local library---with much profit---, but would buy it only if its price were half the current price tag ($32), at maximum.