Ive used this before in a stepper and so far it has held up OK.
Hey Goodolddays.. its easy from this end to say its enjoyable.. ive had many an EM make me pull my hair out.
I must admit that i was getting to the point where i was going to pretty much throw in the towel as we had exhausted all logic paths and suggest you follow each wire from the BUST relay to find some worm braid that was giving ground on a piece of metal or even 2 wires worn away against each other.... horrible work, but ive had to do it so many times