I carry one with me. I don't always have the time to be able to use it when I set up but if I do have time I definitely use it. If time is allowed I like to range 2-3 diferent objects from my left to my right depending on my set up and try to remember those ranges this way if they come close to those objects then I will have an idea of what pin I need to use. I try to attend a some 3D shoots in the summer this way the range finder is just a backup plan.