While not amazing, I think this flick (despite the horrible title) is actually pretty serviceable, in terms of how well it does for the era. There are much better late 50's horror movies, but The Manster is pretty competent in most of what it sets out to do. It's held back by a few too many chase scenes, though. Otherwise, it may well be worth a watch.
What did you think of this late 50's monster (dare I say manster? [*no*]) movie?
(http://fight-evil.com/movies/years/1959/262-2.jpg)