The content is as good as it gets. If you only buy one book, make it this one (although maybe not this printing). It is a guide to living a good life regardless of what may happen around you. Things don't happen TO you; they simply happen, If you treat events in this rational way, their impact on you is lessened, in fact virtually eliminated. You can choose to be happy in any circumstance. Limit your desires to those things which you can get by means within your control, and you need never be disappointed again. Be ready to say 'Who cares?' to things you could have wished for or events outside your control, and they need never concern you.
The tragic flaw in this printing is that it is much, much bulkier than necessary, meaning that it will not fit in the pocket of your cargo shorts, for example, when it should have been able to fit in such spaces. It looks like it's been run over by a semi truck! It's about a half inch thick, and about 7x10 inches, when it could have, should have been about 3x5. I'll have to buy another copy so that I can easily carry it at times, and I'm mad at myself for not checking on the dimensions before buying. I assumed the book would be built to a common sense blueprint, and I was wrong to assume!
So, get the book, by all means! If you are rational and want to be happy, you NEED this book. But, be warned that you will want to carry it with you at times, because it is that important and useful, and this printing fails miserably in conforming to that desire. So, look for a smaller printing.