I guess I like quality equipments, my reloading stuff, chronograph..........
My Leica 800 range finder. One day I used it on a bow mule deer hunt I guided. We saw to large 4x4's across the canyon and up aways with does during the January rut. There was about 2 feet of snow. real steep sided canyon. I decided to go up the bottom , then climb straight up to a large round cedar. First I range finded it at 400 yards to the cedar, then 435 yards to the buck. So we knew that it was bow range of 35 yards if we got the big round cedar with a dead fall near it. When we got where we thought we were right below the deer it was decided just the hunter would go up. I waited in the bottom freezing. He climbed up quite in the snow, in white camo I couldn't see him. Fired and missed at 30-35yards. Deer runs and then takes one last look back again. 68 yards , the buck is broad side but he jumps the string and the arrow goes right up his ????. We tracked him 4 miles and 4-1/2 hours later we finally found him with just the green nock showing. It was the smaller of the 2 bucks and he scored 178". That was a hard day but it was fun to.
So I'd say they are pretty useful, or I might not have thought of that plan in the first place. Plus long range it's better then the alternatives.