Product review (5 stars): Fast, Easy, Cheap & it Works!
Fast and easy! We installed these over a week ago, without any extra adhesive, and it is holding up.

Make sure you thoroughly clean and dry the granite before sticking these on. We scrubbed with vinegar because we didn't have any alcohol, but alcohol is recommended. Also the instructions say to tighten and secure these using clamps for 5 minutes. We bought a pair of $5 clamps from our hardware store and tightened the clamps for some 15 mins to be safe. I have a feeling a lot of the people that say that theirs didn't stick skipped the cleaning or clamping steps.

Even if these un-stick, I would still give it 5 stars.. It's not too hard to put some liquid nails on them in the case they come loose. It would still beat  our other options.