If you've got access to that book, Woodie, read it.
I think it gets all the rave reviews because the text portion is actually readable. It doesn't just give you a bunch of tactical puzzles; it categories tactics into things to look for. It's better than tactics trainer, and there's actually some humor in it.
It's the only chess book I've ever made it to the end of.
Chess Mentor is pretty lame IMHO since it is not based on an underlieing chess engine.
To me it just seems like more TT work.