I am now on Phase 3 of Mandarin Chinese, and I can't recommend it highly enough!
I live in southern China and this has helped me immensely in picking up some of the language. 30 minutes a day is SO worth it. That being said, I still like to get a cup of coffee and focus a bit. I can't really cook and do this at the same time. I am trying to maximize that 30 minutes...
Also, once you are through with this part, I might try to jump on something that will help you learn writing if you are interested in that. It is a little bit of a disappointment to myself that I didn't do that earlier. Still, for speaking and listening...you can't get a better 30 minutes in my opinion.
I live in China and almost everyone I talk to is blown away at how fast my Chinese is progressing. A cab driver yesterday said "Ni de jongwen bi wo de jongwen hao" ---Your chinese is better than mine. I have done almost zero studying apart from Pimsleur.
I'm also doing some rosetta stone on the side to cross pollenate, but I've only done 1 lesson of that.
There are times when you feel like you are lost, but that happens with any language, and any method. (I did Spanish through a similar classroom style pimsleur method, not actual pimsleur, but a similar auditory learning style) Keep plodding through and you will get there! Relax and be confident!
I am now on Lesson 63 of Chinese (Unit 3 lesson 3) and I couldn't think of a better way to spend 30 minutes a day. They all follow the same pattern. I will always start here with foreign languages.
Having studied the Irish language in a number of formats, I can't deny the effectiveness of the Pimsleur method for learning SPEECH. The approach is very logical, and the material is useful for the casual cultural tourist or the beginner. Unfortunately, Pimsleur has only 10 lessons of Irish, enough to get you started, but little enough to leaving you hanging after lesson #10. Come on, Pimsleur... if you can do 30 lessons of Russian, surely you can do as much for Irish.