Here's some positive reviews that may give you more of an idea of what kind of a film this is:
http://popshifter.com/2012-10-10/dvd-rev...k-rainbow/
http://www.eyeforfilm.co.uk/review/beyon...-wilkinson
http://www.sbs.com.au/films/movie/15096/...ck-Rainbow
http://www.revolvermag.com/news/the-best...-2012.html ("it’s as if the ’70s dreamt what the ’80s might be like, complete with weird thumping synth music, '2001' sets, Mario Bava-style lighting, and glacial pacing")
http://www.craveonline.com/film/reviews/...ck-rainbow ("like your third year film school assignment, provided you were the kind of film student that ate LSD by the fistful, and lived with a Nixonian level of paranoia")
http://www.brianorndorf.com/2012/05/film...inbow.html ("Who really needs drugs when there are screen offerings like 'Beyond the Black Rainbow' around? A psychedelic voyage into center of the mind [...] a widescreen fever dream coated in candy colors, glowing sets, and scored to an insanely atmospheric synth throb that swirls sonic paradise with a heavy John Carpenter influence [...] offering delirious visions that hypnotize and repulse [...] engineered to confound and disturb, creating a specialized moviegoing atmosphere for art-house daredevils. It’s a convincing effort with an unbelievable alien landscape to survey.")
http://www.dustinputman.com/reviews/b/12...ainbow.htm ("A psychedelic study in free will. A freaky-deaky meditation on the brevity of life. A fantastical crescendo of the futuristic present as seen through 1983 aesthetics. A collection of imagery and sound that doesn't pay homage so much as it seriously equates itself to the calling-card work of yesteryear by the likes of Argento, Carpenter, Kubrick, Cronenberg, Lynch, and Hooper. [...] holds a rhythm, feel and moody intuition all its own [...] the kind of special, remarkably rare motion picture that should keep on giving through the ensuing decades, so overflowing with lofty ideas, bizarre head trips, and out-there flights of nightmarish fancy that one could see it fifty times and probably get something new out of it in each sitting. [...] the cinematography by Norm Li outdoes itself, each shot taking on the appearance of a vibrant-colored painting as seen through the eyes of a hallucinating, time-traveling hippie from the 1960s whose just stepped foot into 1983 after a quick trip to 2075.")
http://www.comingsoon.net/news/weekendwa...id=90247#2 ("a trippy homage to the midnight movies and video store nasties of the early ‘80s [...] combines the visuals of Kubrick with the sensibilities of John Carpenter to create something truly unforgettable [...] a film that's shockingly disturbing at times but also quite beautiful in its artistry")
http://www.avclub.com/review/beyond-the-...nbow-75226 ("a giddy drug-trip of a movie [...] melts into eerily surreal imagery [...] like the end of '2001: A Space Odyssey' if everything went horribly wrong [...] like it’s being viewed by someone so high on acid he or she can’t pull back to put together the larger picture")
http://www.timeout.com/us/film/beyond-the-black-rainbow ("’70s-style sci-fi mind-fuck [...] a welcome attempt to bring back the days of 'El Topo' and 'Eraserhead', when night owls embraced directors who wanted to screw with viewers’ heads")
http://www.slantmagazine.com/film/review...inbow/5424 ("The film is the cinematic equivalent of LSD: You will see things while you watch it and not know what to make of them. It's an immersive trip that's bound to work you over completely. Whether it's a good trip or a bad trip depends entirely on the person.")
http://www.nickschager.com/nsfp/2011/04/...11-a-.html ("A reverential ode to Kubrick, Argento, Cronenberg, 'Altered States', John Carpenter synth scores, ‘70s sci-fi and ‘80s fantasy, and mind-boggling, hyper-stylized madness, 'Beyond the Black Rainbow' simultaneously pays homage while blazing its own uniquely insane trail. [...] Even that description doesn’t convey the initial out-and-out weirdness of 'Beyond the Black Rainbow', which plays like a feature-length tale set in 2001’s climactic alien-heaven netherworld [...] It’s an LSD nightmare of ferocious psychosis, the foul flipside to 2001’s 'Star Gate' sequence. [...] delivers a feast of perplexing spectacles")
http://popshifter.com/2012-10-10/dvd-rev...k-rainbow/
http://www.eyeforfilm.co.uk/review/beyon...-wilkinson
http://www.sbs.com.au/films/movie/15096/...ck-Rainbow
http://www.revolvermag.com/news/the-best...-2012.html ("it’s as if the ’70s dreamt what the ’80s might be like, complete with weird thumping synth music, '2001' sets, Mario Bava-style lighting, and glacial pacing")
http://www.craveonline.com/film/reviews/...ck-rainbow ("like your third year film school assignment, provided you were the kind of film student that ate LSD by the fistful, and lived with a Nixonian level of paranoia")
http://www.brianorndorf.com/2012/05/film...inbow.html ("Who really needs drugs when there are screen offerings like 'Beyond the Black Rainbow' around? A psychedelic voyage into center of the mind [...] a widescreen fever dream coated in candy colors, glowing sets, and scored to an insanely atmospheric synth throb that swirls sonic paradise with a heavy John Carpenter influence [...] offering delirious visions that hypnotize and repulse [...] engineered to confound and disturb, creating a specialized moviegoing atmosphere for art-house daredevils. It’s a convincing effort with an unbelievable alien landscape to survey.")
http://www.dustinputman.com/reviews/b/12...ainbow.htm ("A psychedelic study in free will. A freaky-deaky meditation on the brevity of life. A fantastical crescendo of the futuristic present as seen through 1983 aesthetics. A collection of imagery and sound that doesn't pay homage so much as it seriously equates itself to the calling-card work of yesteryear by the likes of Argento, Carpenter, Kubrick, Cronenberg, Lynch, and Hooper. [...] holds a rhythm, feel and moody intuition all its own [...] the kind of special, remarkably rare motion picture that should keep on giving through the ensuing decades, so overflowing with lofty ideas, bizarre head trips, and out-there flights of nightmarish fancy that one could see it fifty times and probably get something new out of it in each sitting. [...] the cinematography by Norm Li outdoes itself, each shot taking on the appearance of a vibrant-colored painting as seen through the eyes of a hallucinating, time-traveling hippie from the 1960s whose just stepped foot into 1983 after a quick trip to 2075.")
http://www.comingsoon.net/news/weekendwa...id=90247#2 ("a trippy homage to the midnight movies and video store nasties of the early ‘80s [...] combines the visuals of Kubrick with the sensibilities of John Carpenter to create something truly unforgettable [...] a film that's shockingly disturbing at times but also quite beautiful in its artistry")
http://www.avclub.com/review/beyond-the-...nbow-75226 ("a giddy drug-trip of a movie [...] melts into eerily surreal imagery [...] like the end of '2001: A Space Odyssey' if everything went horribly wrong [...] like it’s being viewed by someone so high on acid he or she can’t pull back to put together the larger picture")
http://www.timeout.com/us/film/beyond-the-black-rainbow ("’70s-style sci-fi mind-fuck [...] a welcome attempt to bring back the days of 'El Topo' and 'Eraserhead', when night owls embraced directors who wanted to screw with viewers’ heads")
http://www.slantmagazine.com/film/review...inbow/5424 ("The film is the cinematic equivalent of LSD: You will see things while you watch it and not know what to make of them. It's an immersive trip that's bound to work you over completely. Whether it's a good trip or a bad trip depends entirely on the person.")
http://www.nickschager.com/nsfp/2011/04/...11-a-.html ("A reverential ode to Kubrick, Argento, Cronenberg, 'Altered States', John Carpenter synth scores, ‘70s sci-fi and ‘80s fantasy, and mind-boggling, hyper-stylized madness, 'Beyond the Black Rainbow' simultaneously pays homage while blazing its own uniquely insane trail. [...] Even that description doesn’t convey the initial out-and-out weirdness of 'Beyond the Black Rainbow', which plays like a feature-length tale set in 2001’s climactic alien-heaven netherworld [...] It’s an LSD nightmare of ferocious psychosis, the foul flipside to 2001’s 'Star Gate' sequence. [...] delivers a feast of perplexing spectacles")