Ramping feedrates do not appear to be correct. Tests conducted using material: "7075-T6 Aluminum 150 HB" and machine: "Generic VMC". "Reset everything to default" was used, and no values other than ramping Angle were changed.
According to the "Circular Interpolation/Ramping" dialog - when Straight Line ramping is chosen, calculated adjustments are to be applied only to the Plunge Feed output, per tooltip "Ramping settings affect Only Plunging Feedrate". I'm interpreting this to mean that the plunging feedrate will be used to display a calculated feedrate for ramping. However, the output values are in excess of the normal milling feedrate, which is obviously nonsense.