Stone is a low budget exploitation movie, the acting ranges from poor to above average, while the movie is dated and even a little corny at times, it is imperative you keep in mind that the movie was made in 1974.
Stone is 100% Australian, (Written, Produced, Directed and Starring), Not an American in sight. The film contains shots of male and female nudity, as I can imagine Stone was extremely gory and violent for it's day. But the biggest thing Stone has going for it is, the bike stunts, one in particular is a Kawasaki 900 doing a wheel stand!
"Stone" is a quintessential exploitation film that surpassed my expectations, and is a cut above 1979's Mad Max.