I have only used gopro's, contour, and midland. Gopro hero 3 black has the most options and acc - smartphone control, wifi, wifi remote, and one of the few that will shoot 60 fps if those options are impotant. If you dont care about fancy features buy a midland hd under 100 at costco or walmart instead of 350-400 for the hero 3 black. i have no expierence with ion's. The contour is not a amature friendly action cam