Product review (5 stars): quick, easy, very effective
This was a brilliant solution to a difficult problem.  My granite countertop installer didn't bother to do anything with my dishwasher when he installed our countertops (just left the tabs at the front top of the dishwasher loose and not screwed into anything), and so it tipped forward if we had both trays pulled out and loaded.  This simple product took all of 10 minutes to install (mainly getting out my clamps and putting them back) and performed beautifully.  I do recommend putting a wood board or scrap peice of plywood on top of your countertop to avoid the clamp scarring the surface of the granite.  After letting it set overnight, I fully loaded both dishwasher trays and pulled them out, and it didn't tip forward.  That was several weeks ago, and I'm still very pleased with the brackets.