Sure have. I have rocky soil that is very similar to what Dr Woods has and I'm seeing some decent results with the summer blend. I had more growth when I planned a monoculture of buckwheat but that got wiped out within a few weeks last year.
My monoculture of buckwheat also didn't do much as far as a solid cover crop option. After looking back at why I only saw decent success in the summer blend, I attribute it to my plot needing fertilizer that I didn't apply as well as my fall planted winter rye was 6 feet tall when we planned the summer release into it. I think it was too thick to be honest.
I'll be planting the fall release blend this week sometime.
Sent from my moto g stylus using Tapatalk