The content is good and has improvements over the previous version my only nitpick is the printing quality being much worse in this edition. The paper is quite thin and the printing is a bit blotchy but the plots and everything are still clear. That said the improvements and additions aren't super huge. While appreicate them they aren't like mind blowing.<br><br>Still I appreciate the high quality of the text and for an undergrad or even a grad student that may not have been exposed to more advanced aspects of ODEs and general non-linearity this remains the best text I know of. I owe it to introducing me to two-timing a technique I still take advantage of to this day.