So I was looking at the Lee site, they have the "LEE 50th Anniversary Kit", and a new one called "LEE BREECH LOCK CHALLENGER PRESS KIT" which features the same components as the 50th kit but they have replaced the Safety Prime with the Auto-Prime and a set of Auto-Prime shell holders. They say this kit is for those who prefer to prime off of the press.
Is the Auto-prime really better to have than the Safety prime ??
I have the Breech lock kit with the auto primer and it works very well for me.
I like to prime off the press, but some people prefer the other way. Either way is good IMO. You can't go wrong getting either of those kits-- go for it.