When the hood is flipped up, it comes off the hard hat really high. This leaves the full weight above your head. If your hard hat isn't cinched down tight and you lean or bend one way or another, the wide lens auto darkening hoods (titanium) are too heavy and will pull your hard hat off. I can see where the adapter would work fine for a smaller lens/lighter hoods.
ProsHard hat brim can stay in a forward position.
Stays attached to a hard hat very good.
ConsLeaves hood too high on your head when flipped up.
Unbalanced hood will pull your hard hat off if it is not cinched down.