We had the water line tile installed, liked the tile, yet, once the pool filled, we weren't that impressed. Now, don't get me wrong, the wife and I like it, but we were expecting something more, not sure what.
People who come over, though, appear to like it more than us. So, if I had to do it over again, I'd still put the tile in. Ain't as big a bang for the buck, but I like it.