Project Farm did a good review of these a few weeks ago:
https://www.youtube.com/watch?v=g5_64r2PR7A
I have a 3T HF aluminum jack that's an Arcan knockoff, but I usually only use it to support axles when one of the trucks is on the lift. It does work well, though, and it's way lighter than a steel jack, and so much better when I need something for the trailer tool box.
For lifting vehicles, I'm fond of Rotary:
Mark