What is nice though, is that the book contains many so-called queries, which are possible explanations of various optical phenomena, explanations/assumptions Newton could not prove/disprove at the time. This is fascinating reading, because many of these turned out to be true (or false, but even then: still interesting to know what he thought).
Overall impression: if you are interested in the history of optics/Newton then it is a nice book. But just for browsing in the evening: no.