As a person that owns a Dillon 550 a 1050 and 2 RCBS rock crunchers I’ll say it all depends on your shooting habits. If you are a high volume shooter i.e. when you go shoot you bring lots of ammo and several calibers or simply the frequency you shoot is high than certainly get the 550. If the volume or frequency of your shooting is low, than a single stage will work or if you are always short on time like me then a progressive is the way to go.