I had heard of purple potatoes before, but I thought you could only get them at fancy grocery stores. I actually found these at Costco! 4.99 for a 7 lb. bag. They taste exactly like regular potatoes, which means, they don't really taste like anything unless you season them.
I have heard they have more nutrients than regular potatoes (colorful veggies). Don't know if it's true or not, but hopefully.
Funny, I made a breakfast skillet for stepson and he asked me if they were chinese 1000 year old eggs. Which are purple too (but not 1000 years old)