This movie is of the more 'comic book' genre of old 50s sci-fi rather than the more serious thoughtful ones of it's time, here the plot is not likely to get your brain cells going, and it was originally released in 3D, but thankfully they didn't go mad with it like in some movies where you're constantly distracted by long pointless scenes of folks extending aerials out towards the camera or similar, this works just as well in 2D.
The script is more than a little dodgy at times, some of the actions of the main characters just don't make sense, the male lead's decision to protect these hideous aliens who keep abducting and taking on the form of the local populous with only their word that they're unharmed, whilst they occasionally threaten or try to kill him, is rather odd to say the least, and the shots of the 'scary aliens' swooping into camera are quite obviously tacked on later to provide a popcorn throwing moment, and the dodgy one eyed alien model (ironic for a movie in 3D to have their main characters represented as having no depth perception) has an eye that resembles those sew-on teddy bear types, and looks quite comical!
However, it still has some genuinely creepy scenes and even the occasional 'wow!' and the dialogue is pretty poetic at times, but there are a lot more unintentional laugh out loud moments, so it's not something you should take too seriously.
The extra's aren't bad, the commentary has many interesting details, and it's worth getting if this is your kind of movie and you and your beer buddies have a sense of humour!
But it's no 'The Day The Earth Stood Still'.