I do have a mix of a number of brands. Haven't had any issues with Forster or Hornady seaters, I prefer the seaters with a sliding sleeve, they do seem to work better. Where I can, I have replaced my neck dies with the Forster neck bushing/bump die, they work well for me, quite convenient, have 4 or 5 of them now, would be nice if they made a bigger selection. Only once had an issue with an RCBS, had the wrong sizing ball in it right off the bat, easy fix. I like oddball cartridges, so I have to get what dies I can for them, really never had any issues with what I've picked up, usually RCBS., occasionally Redding, usually used ones. For the ones I can't get a bushing die for, I have taken to using a neck die with no button and Sinclair expanders where possible.