This works terrific in our guest bathroom.  We have a sliding door there, making it more difficult for some people to crawl into the tub.  This affixes firmly to the opposing wall -- its location a matter of personal preference -- and provides a firm handhold for entering and exiting the bathtub.  Also, convenient for gripping as you shower (i.e., shaving your legs or washing your feet.  An excellent alternative to a builder-mounted grab bar.