I have two SmoothSteppers.
With one of them I was chasing some tuning problems and decided maybe the USB was not providing enough current at 5v.
The SS can get it's 5v supply direct from the USB or an external source so I hooked up an external 5v supply to see if it made a difference.
However I did something really stupid and by mistake hooked it to ten volts.
Well as you can imagine my gross abuse was more than the SmoothStepper could withstand and I damaged three small driver ICs on the board.
I told Greg at Warp9 Tech Design about my stupid mistake and asked about the possibility of replacing the driver ICs or ordering a new SS.
Greg said "No worries I will replace it for free" and he did. You can not ask for better customer support than that. Thanks Greg.
Goes with out saying I have no interest in Warp9 Tech Design, only a very happy customer.
Greg (running two SS and they are great)