FYI ...the Genaddi gromets are not physically different that ours. They are not metal or anything special.
After looking closely at them in a couple cars it appears they are our gromets, painted silver. And re-installed.
A couple pics we see of the prototypes apear to show a genuine metal gromet or cover. There is not visible salt shaker bottom in those pics.
I suspect they were not done for cost reasons or the fact that they will get very hot and could burn your back, thighs. Not real comfortable in hot weather. But look very stylish.
I contemplated this upgrade, but when messing around with the idea and some vinyl mock up, it seamed a little busy to me. Not so much from the inside, but looking from the outside. It took the eye away from the shape of the car to me. On the GTX 1 with no roof, it tends to have a different, better effect IMO. I would not be opposed to a test fitting to evaluate in real life though.