Polaroid EE44.
My one broke (shutter release stuck) without a reason and without a symptom one sad day during my childhood, and it was not economically repairable. Cameras must not just stop working for any unjustifiable reason. Besides, the trip of the shutter release was very long before actuation (talk about "lag"), the cube flash was at the nearest point to the lens, even the shutter - diaphragm commands were not clear (are not clear today). A disappointment.

This happened in 1977 or 1978, between my Kodak Instamatic 36 (gifted in 1973 or so) and my first "real" camera, Minolta SrT100x, 1979 or 1980 I think. I almost forgot about my Polaroid. It worked for less than two years, I think.