I am super happy at this moment, that I invested the few euros. Just the next 75cm ball inflated, while looked at the clock and got loose 7 minutes. Without sweat and with ordinary effort. Class.
The device is indeed plastic, but for the price we must firstly not expect steel and secondly, it is far also robust. I can imagine so fill 100 balls ... but no longer today :)
Very strong buy recommendation from a customer who already has a heavy pumping with a bicycle pump behind.