BravoOne,
Both books are quite good, I bought the PPL Confuser myself and the Q&A for the PPL was bought for me as a birthday present.
The Q & A book gives you about 10 sample exam papers and at the back gives you further points of reference for further reading should you need further revision on that particular item.
The Confuser, despite it's occasional errors and that you need to take about 20 questions at random, depending on the subject to get an idea of an actual exam paper, the section where the answers are given is quite good as it will tell you what the correct answer is, why it is, and also why the other choices are incorrect. and a little footnote for each explanation of where you can do further reading on that question.