The onset of arthritis, or maybe just the effects of some aging inspired me to look for something that doesn't require repetitive squeezing. I had used a Lee Autoprime and then the RCBS tool (which is much better IMO) for years with great satisfaction, but when loading up to 500 rounds in a sitting it began to bother me. I bought the bench mounted RCBS system and I think it's great. Filling the primer tubes is just a little tedious but not all that objectionable.
