I know a benchrest shooter and he puts a chargemaster in a cardboard box at the range and does load development. He shoots very small groups.
I was watching a video from speedy Gonzalez at a br match and there were several chargemasters there.
Mine did good when it did good. Had good sd and shot good groups with it. I just got tired of the wandering scale and the overthrows every other charge. In speedys video he mentioned running it off a dc power pack kept the scale from creeping. Never got to try it with mine.
I ended up cutting the neck off a 7-08 case and putting it over the tube on the dispenser. Kind of like the straw mod. Made one from a 243 case also. It helped with overthrows a lot.
In the end my dispenser wigged out and would only run full blast. Still have the scale though.