I would really try it for 10$ but at 20$ (28$ in Canada) for 83 pages, it’s really too much money.
I truly hope that the stuff you learn from this book is worth more than a McDonals meal (your 10 or 15 USD), disregarding how many pages there are. And I certainly did not want to add plain filler content just to make the book read longer.
In any case, decide for yourself and I think you can even apply for refunds on pragprog if you truly hate it!
Have a nice weekend, Marco