I started with a Rotor and changed to a Spire its an all round better loader in my opinion
Holds more paint, Has an anti jam system inside it and is lighter, The SF speed feeds are also a lot better
The spire is 3 Separate parts and easier to clean (Shell, Feed tray, Lid/speed feed
The Rotor is 6, Body, Top shell and 4 separate Rotor pieces
The R2 loader is lighter than both the R1 and Spire but the R2 loader now 7 pieces
The best thing the rotor has is the battery life I personally left my batteries in the loader and used it all year without having to change them
With the Spire if you left your batteries in the loader they are usually dying after 3-4 weeks with use they obviously last a lot longer if you remove them at the end of the day.