I've got something like 10,000 rounds through my 4 hole Lee - and if you remove the index rod you can run it in single stage mode - or manually change between two dies. With extra turrets you can preset every caliber you load with four dies and caliber change take seconds - plus powder change, which can be quick if you have multiple dispensers - or quick change drum style - and a bit longer if you have to swap disks etc each time.