I've heard some people to call 80s 'The Golden Era' and now after I saw this again after so many years I realized why. One of the greatest Sci-Fi movies were produced during this 'era' and even if you see them now again they will still keep you excited. I haven't seen this one long time ago (more than 10 years). I still remember how much amazed I was when I first saw it. I saw it so many times after that and I was enjoying it each time while I was watching it.
You can see the movies like this one these days. There weren't technologies which they could use to create such effects. That's why they (the effects) were just a part from the story and they weren't as many as they're in todays movies. The movies were so good because they were done with a real imagination.
Now the story some how stays like a background for the effects. They're doing movies which are rather like 3D PC games. They aren't interesting stories and they aren't cool characters. Effects only.