I have the 6th edition. I have used Probability and Statistics books from Ross, Hogg, Mendenhall, and Marx. I say this is the worst one because it has very little explanation and examples, but many unsolved exercises. Also, it is hard to follow. Here is a sentence and you be the judge:
"The exponential distribution applies not only to the occurrence of the first success in a Poisson process, which is what we call a situation like that described in Exercise 5.48, by the virtue of condition (iii) (see Exercise 6.16), it applies also to the waiting times between successes."
So, if you don't mind jumping around in the book, maybe you would not mind it as much. I am not kidding; you have to go back and forth all the time! I was just reading it, put it down, and logged in here to write this.
I like Mendenhall's "Mathematical Statistics with Applications" for quick and clear explanations (best as 1st book)
Ross' "First Course in Probability" for deeper understanding.
Hogg's "Probability and Statistical Inference" is my favorite.
Marx' Mathematical Statistics is ok (not many examples), but far better than this book.