I live 15 miles from there, its a beautiful, popular area, that is easily accessible via nearby carparks and riverside paths, so great for family visits. There are more challenging routes on the surrounding hills and moors, so attracts a variety of people there to enjoy the outdoors, its common for the large carparks to be completely full. I can't comment on the mortality rate at the Strid, the photos and videos do not do justice of how dramatic it is and how loud the water is where it escapes from the narrows. You only have to go a short distance downstream (1/4 mile) and there are safe paddling spots after the river widens again.