Been using it here and there, but mostly on small parts like bolts, suspension arms or wipers, it can be a very useful tool if you can get used to modeling that way. In your case of modeling assets like the concrete barriers, is the best way to go to keep poly count down.@A3DR has used it in the past on some cars, not sure if its still a part of his workflow or not. I've been interested for a while but never really wanted to try it on a more complex project, but something like this is ideal. I also went back and did the same to my normal road pavement edges.