Product review (5 stars): Worth it at twice the price.
Have been installed under a quartz counter top for about 12 months with no problem.  One screw did vibrate loose and got lost but went to the hardware store and got a replacement.  Followed the install directions as instructed and clamped.  Let the dishwasher stand after unclamping for 24 hours and have had no problem with the dishwasher come loose and tipping.