used a GoPro with waterproof case too, edited with a cheep video-program and satisfying results. What I did like had been the tripod aids with suckers. Mounted on the tiles it had been possible to take videos of my own allone. But since two years taking videos or photos at the pool is strictly forbidden in all pools in town :-((
BTW: Are there free versions of Coach's eye available anywhere... or at least a fixed buyable? I don't like mandatory subscription software...