Originally posted by NorrisB
sharpen your tactics is worth the money, if you need a hard copy, I own alot of puzzle books and that one is the best
Sounds like the OP should buy the copy from the guy who doesn't like it.
I think "Sharpen" was the right level of difficulty for me at the time I worked through it (1700-1800 uscf) the 1 star problems were doable on the train and while often one movers they often had some unique aspect to them that made them worth seeing.
the two star problems were also train material but they took probably 2-3 min to find the answer instead of sub 1 min.
the three and four star problems were hard enough I might get stumped on the train and have to pull out a board when I got home.
Haven't looked at the book in a couple years but that was my notion of it. Since this book went OP I do think quite a few good new tactics books are out there. The key is finding the right level of difficulty etc.
By default tactics books have to be very good since they compete directly with websites and ct-art now.