I plan on picking it up soon. I heard it's really really good.

I think it's like 20-2-0 as far as people that I've talked to that have liked-indifferent-disliked the book so far.Tendler has a great reputation and the book has received excellent reviews so far from most people.It's rare for most people to recommend a book they haven't read, but I'm comfortable recommending this for players that are struggling with a variety of mental leaks (tilt control and other emotional issues, volume and quality).

It's the nuts in its field. You need it if you are at all serious about poker.

I second what Cog said. The book is worth it's weight in gold. Has helped me tremendously with my tilt issues. When I get sucked out on on the river I no longer throw a fit, i laugh and thank the guy for calling my 4-bet all-in preflop with QTo at 30bbs :)