I used the first edition as a textbook in undergrad 35 years ago, I kept the book for a reference until it finally disintegrated at the binding.  After searching, and seeing that I had two choices, the 2nd and 3rd editions, I opted for the 3rd edition and note that it is still the standard for Applied Mathematics.  I have taught "Math Methods" on and off for quite a few years and still go back to this book as the go-to text for that course.  I also use it as a supplemental text for my physical chemistry course, when I teach that.  My students find that it is a pretty easy book to grasp, and especially useful, especially for those just starting second year calculus.