Yes, they are edible. No, I haven't tried them. My understanding is that they do lack the flavor of peppers grown as a true vegetable though.
This variety of ornamental pepper is called Black Pearl.
Black Pearl grows rapidly and outgrew this hanging basket by the first of July. So I replanted the plant in its own pot. They thrive in full sun (which this was) and humidity, which we have here in southwest Missouri.
The sun turns the leaves this awesome purple and the pepper is ripe when it turns a beautiful shade of red. It is now a gorgeous specimen plant!
The Lady behind