I wonder ... what happens if one side happens to be heavier than the other? It looks like only one hydraulic pump, so it presumably produces the same pressure on both sides. If one side was significantly heavier for some reason, seems like the light side would come up first and flip the car sideways.
Looks like a lot of money for 48" of lift, when I can get 24" in about 1/4 the time with just my floor jack & 4 24" jack stands.