Cheaper than manufacturer's branded product and (as far as I can see) just as good. Printer gets a lot of use and printing gets used with a range of clients so has to be good. This toner does the job and at a good price.
The great thing about this book is that it's written and produced with a clear and effective understanding of how to engage students. It develops ideas in a clear and logical way, whilst at the same time presenting material in a style that is non-threatening. It doesn't assume that the reader is a geek and therefore moves the topic into mainstream provision - exactly what the current challenge is.