This is one of the reviews I was eager to do. Pimsleur is a very famous course, loved by some, hated by others. And, I finally tested it to see how Pimsleur works.
The linguist Paul Pimsleur (1927-1976), based on his research on language learning, developed a method of organic learning that brings together three factors, these factors are: verbal intelligence, auditory ability and motivation. The result was the Pimsleur method.
The course is audio-based. There are 30 units per level, each of which lasts about 30 minutes. In addition to the regular lessons, they offer a booklet, the only written material of the course (accompanied, of course, by audio). Each of these small lessons lasts between 2 and 5 minutes, they help to improve pronunciation. In total, there are more than 53 hours of audio.