Product review (5 stars): The PERFECT Solution
I'm glad I found these.  My GE dishwasher brackets came loose under my granite counter, allowing the entire dishwasher to lean forward when opening the door.  These brackets fixed the problem, and it took me all of 10 minutes.  Follow the instructions closely, and you will be fine.  Wipe the underside of the counter clean so there's no dust, etc.  Stick these bad boys on, align the brackets, screw the screws, and you're done.

I have not had any issues with the brackets coming loose, they are so sticky, I can't imagine they would.  I would say if they do, you did not make sure the surface was clean enough before sticking them on.