How is the quality in terms or fit and finish?
Good in black, hi.
I would say the quality of on the exterior of the replica is quite good. The paint is just ~meh, I have seen better. It could do with some wet sanding. But who really looks THAT close at it. The materials are very good, the ABS and PMMA plastics used appear as good as OEM and they include the rubber weather guard where it "mushes" up against your truck
As to the interior, again I would say very decent. The actual circuitry and leds used appear to be similar to the oem osram, difficult to tell frankly but they are the same PLCC 2 package and some attempt is made at regulation. Dare I say the circuitry design may be better than OEM in some ways. I have no way to tell if the actual components used, the resistors and caps etc are rated for automotive use or if they are of Japanese origin. Doubtful.
The quality of the vapor deposited chrome on plastic appears to be a bit cheaply done. I am slightly concerned that it may fade quicker than OEM in the sun. But I would expect this will take several years if at all.
The red lens is sealed well, it uses some gluey goop and an oring vs the OEM being entirely heat sealed. For the consumer, this is a wash. From my end its rather POOPY, but so be it.
Or, if you just wanted the short version, I see NO REASON NOT TO BUY IT. (and of course send it to me so it doesn't appear "broken" anymore
)