When the 8-track phenomena hit it was big deal. Granted I was already a music fan, and collected vinyl. It was still my favorite medium for music, because I just didn't spend that much time in my automobile. However, I remember my parents gave me and my brother a small portable 8-track player for the home, so we started buying some of the tape cartridges as well. It became difficult to decide which way to buy the album: 8-track or vinyl? I don't remember how I made the decision, because I had a limited budget. But I do remember music stores use to have huge displays of 8-track tapes, and there was even 8-track exchange music stores that would allow you to exchange two 8-tracks for a new tape or a new "used" tape or something like that. Plus they'd have a 8-track machine set up so you could listen to some of the used tapes and decide it you liked it or not. I always enjoyed doing that as you could listen to a lot of music that way and discover things you were curious about. That wasn't an option when buying the vinyl.
One of the things I wondered about while watching the documentary was if they people being interviewed were stretching the truth a little bit because as I remember it, the medium was horrible. Granted it had pretty good sound quality, but the tapes broke in about two months or so. Moving tape just has so many obstacles and is not that great a medium. That's another reason VHS and Beta are a dead medium as well or nearly so. At any rate, it was a fun romp down memory lane.
Here's a link to the full one hour and thirty minute film.