The Cinemated Man has this film online at GoogleVideo:
The film itself starts about 2 minutes into the video.
Variety calls it "primarily entertainment for the eye". Moria says,
The 7th Voyage of Sinbad is perhaps the most well-remembered of Ray Harryhausen’s films. It was certainly the most popular and its success formed the template for the best of Harryhausen’s subsequent fantasies
1000 Misspent Hours closes by saying
It’s a good thing for this movie’s reputation that most people see it for the first time when they’re seven years old; without that nostalgia factor working in its favor, there’s just no way The 7th Voyage of Sinbad could ever have earned as much respect as it has.