Not totally useless. As a kid, I built airplane models and displayed them in my room. I had all Century aircraft and the X's. Had a Snark hung from the ceiling, painted a nice fire-engine red. First learned of JATO from this model.
So the Snark may have been "totally useless" as the article states, but to this kid, it was the coolest most inventive vehicle out there. The JATO just got to me for some reason. lol