I have two of them and haven’t had an issue yet. But I’ve only used them maybe a dozen times so far.I think @jjvw purchased these and found they are not all they are cracked up to be. They begin to lose pressure over time.
Only annoyance is that gravity won’t always retract the jack, and it has to be pushed down in some cases.
There is a knock off under the name Alltrade on Amazon. I wonder if those are any different?