Have to call B.S.
I saw a "Rocketeer" fly across the Astrodome In about 1967, and was WAY higher than 50 feet--more like 350. Probably was a peroxide-powered version. Max flight time about 60 seconds.
Agreed, this is not a jetpack, more like a "Ducted-fan" Pack. Still, if we get more flight time, it's pretty cool.