I got the excel chem book, and I find parts of it totally confusing, and it hasn't been very useful for me. Other people think they're brilliant though.
The revise in a month book was better, but obviously, it's not much use until you've covered stuff. I got one for maths, too, and they don't really tell you all that much in terms of how to actually do things, but they're really useful for working out what you need to go back and look at, and what you don't really need to cover again.