I have two machines, an Anealeez and a Benchsource. Both work great.
I anneal every 3rd loading. That has extended the life of the cases for for my Garand by quite a bit. I would typically get 8 to 10 loadings before the necks started splitting, now 20+ is possible and the condition of the extraction groove usually dictates case life. With my hunting rifles, the feedback from sizing/seating is much more uniform.
As for .45-70, with Starline brass and loaded to low pressure, the cases would soot up for their entire length. After annealing, the seal was much better.
