I am looking to buy a water mat to use around my dock for the kids. These are the kind that are about 1 3/4" thick, 20' long and several kids can run, jump, play on them while the mat still floats on the water. I wanted to see if any of you have experience using these and if you like a particular brand? Overtons lists several, Aqua Lily Pad have a couple and so forth. Thanks!