Product review (5 stars): Better safe than sorry
Bought the dishwasher pan because we have solid wood floors in the kitchen and I wanted just a bit more protection, which this seems to provide as advertised.  The only considerations must be the size...because it is meant to fit under something that is 24x20, it has an extra 1/2 inch all around..this was not a problem for us because we were installing new cabinets and could make the room.  If you are putting in an existing space - measure carefully.  Also, it does stick out a bit in the front which could be a problem if you have skirting boards going all the way around.  As you can see from the photo, our skirting boards are not in yet, so I can adjust.  As far as actually protecting from leaks...don't know.  Haven't had one yet, but I assume this will stop the water getting to the floor unnoticed.