I like that design better than the other ones I've seen that mount behind the light and transfer all the impact to the tub
and I do like the way they look.
I had made something like that for my old YJ out of 3/8" solid rod that bolted under the tail light screws
i have these, its more for the look than protection.
X2, I think with any impact that would cause the light to break without a guard, these guards would just cause them to break in a different way. Having said that, they were on my jeep when I bought it, and I think they look pretty snazzy, so I left em' on.