Even though I'm no longer a practicing physicist, I still have Schiff's text on my shelf, up there with Jackson's Classical Electrodynamics, Apostol's Calculus, and Ramond's Field Theory. It was the first physics textbook that distracted me from my problem sets in a good way.
Wasn’t a good book when I was a student. Merzbacher was probably better. Claude Cohen-Tannoudji was rated better by some of my friends - some reported it was low density but clear, just opposite of Schiff.
It offers explanations that in most books are not found. When going through this, you gain intuition due to these explanations and if you are a bit familiar with multivariable calculus, you will aso learn how to do a big part of introductory quantum mechanics using multivariable calculus and not only single variable. This plays a role when for example an integral in more than 1D could go from surface integral to line integral. This is important because with single variable QM you do not see stuff like this. Any way, i think that this is a superb book that is overlooked due to the likes of books like Griffith's book. Other books like Shankar's and Griffith's books are great too, and i think this is on par with them and certainly at a higher level than most of them.