I ended up getting the Franklin Armory unit. I am going to prime a large volume of cases next week and test it out.

I have large hands and this fits me perfect. It feels really good in action. It is clearly much better made. It is much larger and heavier than the Lee and Hornady and I think this would be a handful for normal sized hands.

It is clearly a better design than the Lee and Hornady hand held primer tools I have experience with.

My verdict so far is that it is superior to the Lee and Hornady in every way. Having not used it yet I can't
say anything about its viability in actual use.

The Sinclair and Century are super interesting and most likely the best, but with the volumes I do I don't want to mess with single shot primer feed and prefer the auto feed tray design.

Have loaded thousands of primers of all sizes with the Lee Auto prime for decades with zero issues until it broke, I will have fond memories of that tool.