Product review (3 stars): Be aware of size
If you are having holes cut in granite or other counter, be sure the installer has this unit in hand before cutting the hole. Mine didn't, and I ended up having to send this back. The "standard" hole the installers drill was too big, and this unit wouldn't mount on it. The button fell right through.

Obviously my review is not for the product's use, as I couldn't use it. It does say it requires a 3/8" hole, but I did not know the hole drilled would not be 3/8 -- and you might not either!