This is one of the best introductions to rigorous mathematics! Looking back now, to when I was 18 and had no idea what the proper definition of a limit was, it was this book that gently eased me into proper college mathematics through a self-contained, purely proof-based, introduction to analysis. After this, I was able to pick up other more advanced books on my own, and continue my mathematical journey without anymore hand-holding.
I find it odd that one would disparage this book because it is too 'easy'. If it's too easy then it isn't for you! However, for one that is new to analysis and isn't a total genius, this text lucidly and clearly leads one through the subject, with plenty of motivation and careful reasoning.
Any layman that is interested in mathematics, and is willing to study hard on their own, should pick this up and do as much exercises as possible.