Product review (4 stars): Works as described
Own a house with granite countertops, and the installer didn't make any provisions for installing a dishwasher.  I certainly wasn't going to attempt to drill in to the countertops, and use some type of epoxy.  I found these, and installation was a cinch, and the product does what it says it is supposed to.  I've only had them in for about 2 weeks, so I don't know about how long they will last, but I'm hopeful.  The brackets are fairly heavy duty.  They are not flimsy thin metal brackets.