The volume of examples is really useful as it allows you to see a proliferation of options and helps one learn through repetition and example. It's also good to use in conjunction with www.runet.edu/~thompson/webddes/etable.html which provides all the corresponding .m files. The writing was moderately useful but the sheer number of codes provided for solved problems was what really made it useful. Oh and the codes were actually error-free so they worked on my Matlab! That is more than I can say for some sources.