I have always wanted one of these! I have promised myself that when I have a pond, I'm going to put some of these in it. I can almost see someone trying to use one of those big pads as a boat. You think bullfrogs would like them? ;-)
With my luck, I'd probably be gigged the first night out sittin on it. ;~o
I watched an episode of Rebecca's Garden on HGTV and she was in a pond somewhere foolin with these things. Someone told me she filmed that episode at Longwood Gardens. I don't know if that's true or not.