I can see why cheap and reliable genetic testing you can do without the intervention of medical industry is frightening. For one hundred dollars you can find out if you have markers that put you at elevated odds of hundreds of conditions. If this came from the traditional medical, you would have to go to a doctor who would release the results to your insurance company, it would cost about $1000, and you wouldn't even get to see the results yourself unless the doctor wanted to show you something.
I've done the 23andMe testing and it has been of value. I'm not in close contact with much of my extended family and have almost no contact with the family on my father's side. It doesn't claim to diagnose or treat diseases or traits. What it does do is tell you if you're at elevated odds for a few select conditions, along with heritable traits. This is can be invaluable if you don't know that much about the medical history of your family.