Product review (5 stars): These things are great!
We have a Silestone counter and the installer had drilled small holes in the bottom and installed short screws.  Over time the holes opened up and the screws kept falling out and the dishwasher moved every time we opened and closed and would fall forward with the door open..  Found these brackets and was skeptical, but gave them a shot.  Over 2 months later these things are solid and the dishwasher hasn't moved.  Great product.  Follow the instructions that came with it.  Clamp well for the time period they recommend and it works great!