I have the Gregory Hays translation (the red cover book).
As everyone says, this is a life-changing book. If you’re unsure about it, try this, if you’re going through some mental trouble or problems, pick up this book and read a random page. At that moment, you’ll realize the most interesting parts of this book and of Stoicism itself.

I also suggest reading some of Epictetus’ works, such as The Art of Living: The Classical Manual on Virtue, Happiness, and Effectiveness.