I have always loved logic problems better than any other puzzles. This book definitely delivers some hefty problems. Though it contains only 75 of them, each are involved enough to keep you working on each one for a good while. The only drawback is that the answer section in the back does not have charts. I would have like to seen a graph to quickly see if I'm right or not. Though, each problem does have a talk through section and a concise summary of answers.
Overall, each problem is challenging and has a variety of subjects to keep you involved with it. If you like logic problems, I highly recommend this. It's definitely worth it.