Master Series Ultra arm with bag. Tiffen post as well as reduction post for PRO, XCS.
Later series arm with all the improvements, i.e. rounded elbows and allen fitted screws.
Robust, and just serviced by Robert Luna.
Smooth operating and is as close to feeling like a PRO arm without breaking the bank as you can get. Does not require the force of a 3A arm to boom up and down.