This is only my opinion but I think all this money and time for custom bumpers is only worth it for cars with huge heavy bumpers. Several body styles don't have huge bumpers and chrome steel just looks so nice.
One thing that bothers me is when a car is idling or maybe pulling to the starting line and the front glass bumper is vibrating real bad. I'm betting the chrome steel bumpers don't slow the car down, but I only deal with 9 or 10 second cars, nothing serious.
Again, only my opinion.