Maybe I have only seen one in an old magazine add. I've never even heard of it before. I wonder if it was made in the USA, or Japan because of the slim design.
I have used one. My grandmother had one but by the time I was born she had a hoover convertible (model 70 I believe) and the GE retired to the basement. During a brief period when my moms model 33 was done she retrieved this from my grandmothers basement. I loved it. It was so different from a convertible. In my opinion it didn't clean as well as the convertible. We had it for about 6 months and then my mom purchased a new convertible in 1976 or so and the GE went back to my grandmothers basement. Years later my aunt borrowed it for a brief time and destroyed it. I remember seeing it once at her house and the handle was now cracked with tape holding it together. unfortunately it never made it back to the basement.