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.
I have owned and loaded thousands of primers with the various Lee units, Sinclair, Frankford Arsenal, etc., and the whole complaint about single feeding is largely an imagined problem more than a real one. With a primer tray and proper technique, I can prime cases about as fast with my Sinclair as with my Frankford. The quality and feel sensitivity of the Sinclair makes up for the tray on the Frankford, speaking strictly in terms of production volume.
