Reply to "Quality of GEM kit built brass locomotives from Korea"

I have the Reading 0-4-0, and had the B6sb, but traded it even for the more robust Williams.  The Reading had loose drivers, and I suspect it’s gearbox is good for an hour or so.  I prefer the Gem cab on the B6, but for everything else I prefer the Williams ( which may be closer to 17/64 Scale).  The Williams will run forever.

Edit - that did not answer the question.  I consider Gem to be about halfway between IMP (flimsoid) and Max Gray (well built). I would put them just under Pecos River for sturdiness.  Opinion, of course.