I love the puzzles in this book, but was really disappointed there was only about 100. I paid less money and got twice as many puzzles (and the same flavor of puzzles) from "Holiday Killer Sudoku." If you are looking for more puzzles that are still by The Times, I would suggest that book. However, the puzzles in this book are still addicting and provide a great range of difficulty, mostly focusing on the Moderate and Tricky levels. There are only I think 4 Deadly levels, and the book also starts off with about 20 Easy.
I also like the new time yourself feature. I thought it would be stupid, but I actually found that it was fun to beat the clock.