I have an older car, from the year 2000, and my CD player had always caused me problems, especially when it was either raining or very humid/cold.  I'd say that 90% of the time that I have problems with my CD player, it works to make it work again.  I haven't tried it anywhere else, because I do most of my music listening on my laptop, so mp3's and such.  I'd recommend it, because it works for me most of the time.  I'm sure for me the problem lies with my CD player being so old.  So, it's worth trying if you have problems with your CD player, no matter where.