Bought a pair of these for $9 at WallyWorld.
Looking at my purchase history, I had the Adrenalines a few years back. After watching me run, they suggested the DYAD6. I'm going for a quick run in a bit to see if I need to take them back for the adrenalines again.
It was cool though, Fleet Feet took them back and gave me the difference in price. Even after owning them for a a good six or eight months. I wish people would support their smaller businesses more often.