Under the sink is never pretty, but this helps to make it not only look nice, but makes me feel better knowing the bottom of the cabinet will never get the icky, gross drips and stuff because I can easily take this out and wash it.  I had to get around a lot of pipes because of the dishwasher, and insta-hot, and it was super easy to cut slits for it to fit around them.  The pattern made it easy to eye-ball where I had to cut.