An excellent guide I have been waiting long time for. I will be recommending it to all my students as a basic book for field excursions. But nothing is perfect: I miss that eggs/clutches/cocoons of neither group are not depicted as one readily finds this sort of evidence that something lives in a pond/stream.
Also, the variety of dipteran larvae is not shown with the same extensity as those of other groups although they are far the most species rich group of insects living in freshwater habitats. However, their selection in the guide is still very satisfactory for a freswater enthusiast. Regarding the planktonic microlife, i.e. when you need a microscope to appreciate the beauty of freshwater organisms from your plankton net, you will need another guide (I wish there would be some at this entry level); this book takes the plankton just marginally. But, for what it claims it is, i.e. what you can see by naked eye, it is a gem.