I went thru an NJATC program and in my opinion MH books would be an absolute blessing! Seems most of the books I recieved were put out by the NJATC, and though informative, there were lots of issues with them (mistakes). I still have them and use them for ref tentatively. The format in the MH books, along with the pictures, makes them far better/easier to learn from. I have no idea what it costs the NJATC to print and pub thier own books vs. what they make on selling them to the students, but I guess it is profitable.
The Soares book on grounding is the only book that I recieved that I truly feel is a great book and it's not one of thier pubs.
Not trying to be down on the NJATC, but I just feel if you want to turn out the best electricians based on education/skill you have got to get the best info to the students/journeymen.