The lifting function of the unit is fantastic, but some improvements could be made.
The underneath surface of the jack needs to be equipped with some kind of rubber/plastic material so the metal does not become damaged and rusty after.
The wheels could be a size bigger to allow easier moving and placement, when moving it on rough underground and over ridges there some difficulties can be expected.
The operation with the current valves is a little bit of a hassle. I would choose for round knobs instead of theses levers, that are also difficult to reach.