Has anyone upgraded their Super Jolly burrs with the Dura-Mill /Duranium/ Food Friendly ones?

Where did you buy it from? (and how much)

What are your thoughts on it?

Ive read the titan grinder project thread and the Super Jolly they used there was with the dura-mill ones.
My grinder is from 06 so since its about time to replace the burrs anyway, might as well take a look at the dura-mill ones