Update from 2006 review, though I won't change my rating - ymmv.
While the software explanations are now out of date & the history only goes up to publication, this continues to be a useful tool to explain fMRI to new clinicians or even patients. The math is solid & stands the test of time. In fact, it's possibly the most clear explanation of the basic math behind analysis of brain imaging.
However, it's also just one of many many many books, programs & other tools to help us continue honing our analysis of fMRI. One thing I've learned since 2006 - don't buy every new book. They're expensive & they go out of date very quickly.