Just keep the Lee lubed and it will last almost forever. I've broken one and I suspect I let it get a bit too dry not paying attention.
I've loaded about every brand of primer out there using the Lee Auto Prime. They might have a good reason to say use only those two brands but the main reason I can see is the huge box Federals come in. It is a royal pain to get them into the tray unlike CCI and Winchester.
If you use the press mounted arm you have to pick up and hold each primer individually in your hands. My skin is quite oily and has killed a few primers or so I assume as I had a few failures to fire until I went to the Lee and haven't had one since.
I can't agree more about the Federal packs not being convenient to use with the primer trays. Each primer has to be handled individually and I hate doing that! The only solution to the problem is to use a funnel and pour them on the tray but by that time you've got em moving fast and risk them bouncing all over the place.
As for oily hands, I typically wear latex or nitrile gloves when I load.
1) It helps keep the lead and other heavy metals down off my hands when loading cast bulllets....(I have little ones and I'm the cook at home).
2) It keeps the oil from my hands off of the primers, powder and other components.
3) Handling brass tends to dry the heck out of my hands and wearing the gloves keeps the moisture on them.
You might give it a try if you so desire.
I guess I didn't mention this in my last post:
I've only used one priming tool and have never needed to try another......the Lee Auto Prime. Still have the same one from 1985 or 86 with two primer size trays. I has never malfunctioned and has never worn out....just like most of my Lee loading stuff. Their stuff is low priced and lacks the bells and whistles of the other brands but it always gets the job done for me.