I have owned both Rotor and Spire and my loader of choice is the ..................... Rotor.
You turn it on at the start of the day and turn it off when you have finished
I don't need a loader with a higher IQ than me to load paint into my marker, the Spire did the SAME job but actually failed to load as consistently and reliably.
Also I see a lot of Spire users losing the top of their loaders when diving which never happens to me when using the Rotor. Also the Spire as good as it is seems to wear out the flexible rubber fingers on the drive cone.
I strip and clean the Rotor after each days play, if hardly ever needs anything more than a wipe to clean excess oil from the paint shells.
I would look harder at changing to the R2 .................... but it's far too expensive.