I see no reason to use it unless you do indeed have a back injury.

Also, I have never been a fan of the padding he speaks about that makes contact with your back.

Looks like Dave ran out of money and that thing looks like it would injure your back!

looks dangerous

very similar to a safety squat bar. ssb is widely used in powerlifting as a training tool.

i think the ssb would isolate the back more, the topsquat looks like it simulates the squat just with less shoulder stress. it does look scary how it rotates with the bar though...