For the 60's, it was pretty good. I laughed a few times throughout, for example when they finally revealed the monster. Ahahaha! And the ending was sort of abrupt. I also liked the beginning when they showed the brain of the guy they were operating on...the skin pulled back and no skull? Twaaaa? Oh well, I guess people didn't know as much back then. I also liked how the assistant who got his arm ripped off wandered around the house, dirtying up the place before going back to the room to die. Lol!! Inconsiderate, I say. Anyways. I was entertained. I also think it's ironic that organs can be transplanted, and they don't even have to be human organs. Awesome. Reality is always scarier than fiction.

Better than many current movies of this genre.