Not Great But Not Horrid
Kent Taylor is a real pro and that helps. Some of the other acting is also very good. The beach locale is fairly memorable. Whalen's mad scientist is more goofy than mad. Cathy Downs(often confuse her with Peggy Castle-they are both "wholesome" blondes) is pretty and approachable.
Yeah, the effects are bad instead of cheesy. That just makes me kinda admire the moxy of the producers. Most may disagree, but I like this movie and have seen it several times. Probably because it is a mindless, half-decent diversion. And a dvd won't stress your finances!