This is a very well written book.  Good problem sets that build student knowledge along with thorough solutions provided after the problem sets.<br><br>This would not be a good book for either first year physics students or first year honors physics students.  They may be using this for first year honors at Harvard, but it is doubtful that the students are absorbing more that 50% of the information.  There may be the exceptional student who is already grounded in Calculus and intro diff eqns along with a well developed AP physics, but most first year honors will be in over their heads.<br><br>With that said, this would be a very good third year mechanics course text.  The only real shortcoming is it is missing information on Hamiltonian, non-linear, chaos and such, but that could easily be supplemented during second semester.  This treatise is much much better that Taylor's Classical Mechanics which is overly verbose, introduces other nomenclature at the same time it is introducing mechanics (no need to add to student's burdens by using different nomenclature than they are used to).  Taylor's examples, problem and answer sets are very weak and add little value to that text.<br><br>This particular text should be strongly considered for third year physics mechanics along.