I have had this Pimsleur product for some time now, and have tried to use in conjunction with assistance from my wife who is a native Mandarin speaker and teacher. It starts well, with lessons 1,2, and 3 teaching you useful greeting, and phrases, but when you get to lesson 4, it goes of at a tangent and starts to teach you how to ask directions to college rd, and longpeace street!This continues until lesson 5, by which time you are thoroughly bored stiff!Then in lesson 6 the pace rapidly speeds up, to a point where you are completely confused.
Many of the phrases are only spoken once, and at normal conversational speed, this is far to fast to be able to comprehend, and to get the pronunciation right, which is very important in Chinese. Some of the phrases are repeated slowly starting at the end of the sentence, word by word, but this is not useful. It would be far better if the phrases were just spoken very slowly, and then again at normal speed.
Personally I do not recommend this product, save your money and put it towards a course that will teach you useful phrases at a more sensible speed, so that you can learn to speak accurately in pronunciation and tone quality. When you live amongst Chinese people as I do, you realise very quickly how important tonal accuracy is!