The content is detailed, informative and sometimes repetitive, but please work on the presentation! One would think that by the 7th edition, most of the mistakes in this textbook would have been corrected. I've seen numerous spelling errors and typos, as well as missing figures. This gives it a really unprofessional look, despite all the diagrams and the "easy to read style". The editors should take a course in spelling and typing. If they do not have the time to do so, they should consider spending a few minutes to find out how the spellcheck option works. Proper spelling and grammar are very important, especially for an educational material such as a textbook. Hopefully the eighth edition will turn out to be a bit better.