This morning, October 12, 2017, CBS News did a news report about A2 Milk.
The report featured the Prairieview Dairy in Nebraska, which has been producing and selling A2 milk for years, ever since the discovery of A1 was made (2004?).
I was impressed with the clean look of the interior of the dairy. It looked like the inside of a hospital.
They reported that a regular gallon of milk cost $5. A gallon of A2 milk cost $9. Expensive, but if it works for you, it's worth it.
They only addressed the question of whether some people who couldn't tolerate milk with A1 protein in it could tolerate milk without it. They didn't even mention the possibility of long term harm that A1 might cause.
You can thank Judy Sponaugle for her efforts to make the test available to private owners, so we can determine which of our cows produces A1 beta casein. We can choose which of our cows to milk and breed. One of the best choices an owner can make. No need to pay $9 per gallon and drive miles to get it.