If you love Physics (which our son does) then this is a must-give gift!!  He is in college and requested this as his Christmas gift this year.  I was a little skeptical spending the money for what I thought would just sit on a shelf, but no, he reads them!  This came in the most beautiful presentation...Hardcover in a wonderful, study display box, arrived packaged perfectly so as not to damage the contents.  Once I saw them (and it is a Heavy collection weight-wise) I wondered how they could even produce and sell them at that price--looks Much More Expensive, like a collectors set of books!!!!