Product review (5 stars): Simple and Effective!
I found these mounting brackets after searching through Google.  I did not want to drill into our new cabinets so I took the plunge and went for these.  Since they are cheap it wasn't a big deal if they didn't work.  I followed their directions cleaned under the Granite with some rubbing alcohol clamped them on for about 4 hours.  Screwed in the dishwasher to them and voila, no more plates wanting to roll out of our dishwasher and smash the island.  So far I have had them for a month and no problems or any signs of releasing from the granite.

Wife is happy which makes me happy :)

Great product and would buy again.

***Update****
Well this morning one side came unstuck and the screw fell out of the other.  What my guess happened is the vibration loosened the screw and then after not noticing it, there was too much pressure on the other side and it became unstuck.  It has been about 6 months or so of use, for the price it's probably too soon of failure.  I do believe it was our fault though because we didn't see/fix the one side missing the screw.  We have ordered a new set.

**13 NOV 2012**
Received the new order and replaced one of the grabbers.  I made sure to clean the area that it was going to attach to thoroughly so hopefully it won't pull off in such short of time.