Frankly, I could care less if Key was around or not. Overpriced. Not worth the buck to runners. Best rating for performance is "OK". I had a few pieces of steam, including an H4 GN Pacific that the N scale world considered good back then, but to me it was tender driven with sticky non-powered drivers, stiff, and I got rid of it thankfully to a brass collector who was as eager to buy it as I was to sell it. I rated Kato Hudsons as much higher, and now the Spectrum, Athearn, and even Model Power locos had better detail and peformance and are much less now than the Key ones were back then.
I had a brass Key NYC Mike same story only it had a "decent" mechanism, but the original owner told me the original motor was shegatz, so he re-motored it with a Sagami and flywheel. It ran well, but was way too delicate for even careful handling, so again I sold it on eBay to another collector with the same eager attitude as mine.
I rate Key stuff slightly above Hallmark, but considering the flexibility, adaptability, and standardization of parts in mainline manufacturers, I will take the Atlas, Kato, Lifelike/Walthers, Athearn, and IM any day of the week.
Sorry for having a dissenting opinion, but N isn't better off with brass like HO is.
Ken "FloridaBoy" Willaman