I did try a particular meditation CD several times. I love it, forget what it's called though. Some other people really disliked the "beat" but those that liked it enjoyed a very deep relaxation with it.

Wish I could remember the name of the CD... all I have with me is the unmarked backup copy. Sorry!

It wasn't rain sounds, it was synth exploration stuff. But that's all I remember about it. I did find that I slept better after using it just before sleep. While listening I would feel like my body was asleep but my mind was awake. Interesting feeling.