Question on Mariss' E-Stop circuit

Is there going to be any problem using this circuit as the main "on -
off" mechanism for my controller? Will the dump resistor and my big
capacitor handle the "dump cycles"? I'm just getting the machine
going so I think there is going to be more "on - off" cycles than
usual for a while. Taig mill, 28vdc unregulated ps, steppers.

Or is there another way?

TIA,
Monte

Files section >
Circuits >
Misc. Circuits >
servo E-Stop Circuit.pdf

http://f3.grp.yahoofs.com/v1/UPMuQgTOIOnHlXyh0NethHAbWMdautveTq42paVIQTyP8D2cD7NOlO_csKlDl8AAOQMYjriOZ2ASFHqEkOh7K_u1doGjuaI/CIRCUITS/Miscellaneous%20Circuits/servo%20E-Stop%20Circuit.pdf