Early Purple Sprouting Broccoli

Anyone tried this variety?  It caught my eye, because its rated for down to 10 degrees Fahrenheit.  Apparently you’re supposed to plant it by the end of the summer, it HAS to over-winter in an actual WINTER, and then you harvest in the spring??

I might have to try it.  I’ll have to cover it for the winter regardless, we regularly dip below 10 in the winter, but the concept is tempting!