I have an SX3, cncfusion kit, and a 906 oz motor at 48v on the Z from cncrouterparts, driven by a G540.

If I've understood other threads, its de-rated to just over 500oz. No gas strut or counter weight yet, but it does move the head nicely. Not up and running full time yet, but close. I don't have any of the resistors in on the Z axis. Using the pre-made DB9 connectors w/resistors, also from cncrouterparts, on the 380oz motors for the X and Y axis.