As you can guess, the Harbor Freight clamps are a lot shittier, just look at the sidewall thicknesses above. On the HF clamps the whole assembly twists while you’re putting them in place and none of the other components are as well-made.
However for the purposes of this particular project they work just fine. Once you have them lined up and tightened they can hold a cabinet together just as well as much nicer clamp. And their light weight makes them really easy to maneuver into place unlike my heavy 48″ Jorgensen Cabinet Masters.
So while I don’t think I’ll buy any more of these they can service lightweight assembly jobs just fine.