I think I would class it as an "average to good" motor, providing it does work properly under DiSEqc/USALS signals, and you don't put too large/heavy a dish on it (personally I would now limit the size to about 1m) - and specifically does not suffer from the problem I had with mine which refused to move correctly, if at all, when fed with DiSEqc or USALS signals from the receiver I used at the time (which was, IIRC, an Icecrypt STC3250CCIHD).
The seller (VuPlus UK in Colindale, N. London) told me over the phone that some of these Supreme motors did have similar problems and then swopped it for a Superior version which worked OK when fed with the same signals.