I have this shutter speed available on my Pentax PZ-1p 35mm camera and I have personally found it useful when I am shooting ultrafast films (think Fuji Superia 1600 or Kodak TMax P3200 (or Delta Pro 3200.) I also have it on my Canon 5D digital, but I rarely have use for it since that camera's ISO can easily be adjusted for each individual shot (as opposed to having to work with a whole roll of film.) However, like any available shutter speed, I am sure it is useful in certain artistic circumstances where you may need to try and stop some particularly fast action.