It works well if you want an introduction to the language. It gives you a sense of the structure of the language and a good pronunciation. If you have 15 hours to spend before starting studying actively, go for it.
Take into account that a 3 level 90 lesson course gives you only some 400-500 words, so Pimsleur Polish (1-30) probably no more than 150 words.
Michel Thomas Polish introduces, in less time, more grammar, but other than that it's quite bad. The Polish teacher has a pronunciation defect and the two students are irritating in their hopelessness.
I've used it for Cantonese, mainly because I knew I wouldn't need to learn much, so there was no point in trying to learn to read and write the language (although I know what a few words like 香港 mean when I see them, lol).
In some ways, it's the most "natural" way of learning a language, as we learn our first language like this - we learn to speak before we can read or write the words.
However, I usually prefer to read and write what I'm learning to speak, so I wouldn't use it for European languages, but that's just a personal preference.
