Thanks for the order.
For some reason, this driver has become very popular, but as soon as stock arrives, i will dispatch your order.
The driver is protected, and has error indicator LEDS, so if you get a voltage spike, it will just trip out and it will tell you what the cause is, by looking at the led's.

I think the over voltage protection kicks in at 253V, so if you are living in an area that is prone to high voltage spikes, then you may need to get some surge protection, or you may get the driver going into error, half way through a job, but at least you have the error output to tell mach that motion has stopped.