Haven't used it yet but I purchased (6) sheets of the 3/4"
Honeycomb panels for my deck/cap coring.
Also am using their Coosa equivalent and have (3) sheets of their 3/4"
CARBONCORE 3/4" heavy duty fiber reinforced board, 28lb density panels for my transom and any other high compression areas.
Only problems I've read about the honeycomb is that any cut edges need to be filled with thickened resin and it doesn't take a screw, so you need to cut out any areas that require a screw and replace it with wood or other high density material.