It was a small production so it isn't on TV much, but I thought it fit in quite well with the other two. They're not remakes, really, but variations on the same theme. A trilogy, in a way, and far, far better than Romero's awful zombie movies which fans freak over.
I would agree, that the first two were really good, and from I can remember of the third, it was also a good little film...you are right, they are not exactly remakes of each other, but rather, are variations on a theme...and a really spooky theme, because the person is replaced with an exact physical duplicate, but whats inside, is so very different, and eerie and spooky...I love those types of films...