Well I almost hate to say what happened with me because I don't want to deter anyone from trying it based on what I found with me. We are all different. Obviously a lot of people have good experiences. I may try it again.
The first link Mike posted in the group had a very detailed web-site where he goes into great detail about where he obtained his Kefir grains and how he mixed some from all parts of the world.
It's very interesting reading!