MaxJax... Any reviews

A couple of things in the clip bother my. I use to sell and install above ground hoists.
In the video there was some kind of "nut" in the floor. You noticed he only had bolts and washers to secure the columns. Most hoists use Red Head type expanding sleeve anchor bolts. Check the instructions BEFORE you buy ..It should have min. specs for the concrete floor. Thickness, strength, min. distance to joints and or cracks, and age of concrete. Too green and the red heads break the concrete. This brand also requires that the operator must install the "safety leg" in this case it is a round shaft you have to go find and then install. Are there holes for the safety rod at less than max lift?
I am not saying that this unit is unsafe or bad. We are talking major purchase and trusting life and or limb to any lifting device. Do your home work. Compare to other types in same price range. Then look for ones that have the features as some of the big boys.
Mike