I have had one of these for a lot of years. It really speeds up the total reloading process. It only takes me 10 seconds to dump a tray of primers in the RF100 and turn it on. I then continue to reload while its loading the tube. Saves some time.
The only recommendation is to keep the RF100 clean. Especially the ramps. If they become contaminated with primer residue, it will struggle filling the tubes. You find that it will take multiple cycles to load a tube. I use 70% Isopropyl Alcohol. Get a q-tip and clean the ramps. I also take a rag and clean the base area once in a while.
You will learn to love that machine.