It is well written looks like its been proof read. It has a working table of contents for kindle and the solutions to the examples and set puzzles are correct. You can access some resources on the web which you can print to attempt harder sudokus. The kindle book is 'Worth a Read'.
I may not be liked for saying this but I prefer Carol Vorderman's How to Do Sudoku
for a number of reasons.
o In the hard copy the puzzles are just there you can attempt them straight away no downloading and printing necessary.
o The solutions are nicer and easier to follow.
o The book caters for a greater range of ability.
o There is an excellent number of puzzles at the back arranged in order of difficulty.