I have the Rutex drivers complete with the mother board and relay board setup.
While I havnt yet installed the servos on the machine, I have tested the servos on the table.
I am very impressed at how strongly these drivers control a servo.
by this I mean the speed that they will change the direction of the servo, with no overrun whatsoever.
To look at the board you would never believe they are rated at 100v 20a for each servo.
I am still learning about these drivers and will post information as I go.