Well, it has arrived. I checked with some former acquaintances that are now occupying a normally extremely hot place, and they have confirmed it is snowing there.
After the fourth road failure of my brand new BLI N&W J this morning, I returned it to the LHS where I purchased it. There is now a brand new MTH J rolling around my home layout, with nary a problem. Yet. As of right now, the new engine has already run twice as long as my first BLI J before it grenaded its decoder. It's also run about 30 minutes longer than the replacement did before the smoke unit failed the first time.
MTH still has a long way to go before convincing me their products are "good", but so far, in this, my first-ever purchase of an MTH steam locomotive of any type, there seems to be a glimmer of hope. At least on a case-by-case basis. I still remember the diesels, but that's another fiasco for another story...