If you look at the publicity photos on the website, you can see that the door isn't locked. The sharp corners around the hole will cut through the pulling strap and the hook is so thin that it'll bend or snap if you put any real force on it.
Besides, you might scratch the "durable" powdercoated black finish. (Powdercoated finishes scratch really easily).
wtf is the point of those 'demonstration' photos? as putees said, the door isn't locked, and in any case if it were, you'd need a fairly tough back plate to put pressure onto for the 'widowmaker' to function. as for it's grate removal, etc. i thought a length of decent chain would be just as, if not more, effective and a lot easier to acquire.
all in all, i think it's sh1te. seems to me to be an overglorified weapon rather than a serious tool, and it's name would certainly suggest as much.
Just to rub it in a bit further, the door frame is fixed to a pair of floor runners that are fairly obviously aluminium (nicely made, I might add). These in turn are bolted down with 6 or 8mm anchors, one in each corner. If the tools that are described in the various pages of the site were actually used in anger, the floor runners would be mashed and the anchors would have pulled up. 3mm aluminium will always give way before 6mm steel.