If I wrote "A must read for every physics student" then it felt more like duty. But actually it is fun to read the Feynman lectures because they are so inspiring. One of those rare books that are written so well that it becomes fun to study - even such abstract things like physics.

Few scientists have a talent to present abstract things as well as Feynman. Daniel Kahneman and Sigmund Freud, whose lectures are also a pleasure to read, come to mind.

I couldn't read the Feynman lectures for my courses though (we followed the Berkeley physics series), but when ever I want to refresh my mind or find a nice way to explain things to students, these are a swell reference.

I still prefer the printed version though because of its nice layout with images and drawings in the margins.