[saps]

On mine (430HP 351W), they never provided a reason for failure. I had to have it pulled and shipped back to them for inspection. If they determined it wasn't their problem, I was going to be responsible for shipping costs. They determined it was their problem (apparently since they repaired it and covered shipping costs).

I haven't heard of any other with "catastrophic" problems.

Honestly, while I was upset about the failure I'm not sure I could have asked for a different outcome. Would other engine builders have covered removal / re-installation if they hadn't done the original install?