I enjoyed 'The Fly' a lot. A good sci-fi story with a dash of 'don't mess with mother nature' thrown in...and after all these years, it still retains a lot of it's creepiness. The plot is pretty out there, but I think the actors did a really good job with their performances. The special effects seemed a little understated, but, for me, that worked to the movies' advantage. I always thought it was interesting that while Vincent Price was in this movie, he really didn't play a main character or have much to do with the more macabre features of the movie. He more or less played it straight, but I liked that, seeing him playing role where he isn't exuding that sinister aura that he does in a lot of his movies. I also think this is a beautiful looking transfer with vibrant colors. And the end still always gives me a shiver up my spine. A solid movie overall.
'The Return of the Fly' suffers from an obvious lack of originality and financial support. It is in black and white, while the original was in color. I don't have an issue with this as I think some movies look better in black and white, but I was a little disappointed in how closely story in this sequel matched that of the original. And the fly head and fly arm used in this movie seemed more comical, played up for visual effect while the fly head and fly arm in the first movie were more understated, and, to me, worked more effectively. Basically, this seems more of a remake than a sequel, with a few new things.
If you like sci-fi, then I think this DVD is a really good addition to your collection, and having both movies on one disc is certainly a decent value. The four stars I gave are for the original, while I would only give the sequel about 2 1/2 stars.