MicroTrains couplers are very reliable. They are compatable with Accumate couplers (which show up on Atlas and Athearn stuff). I find the Accumate shanks are longer than I'd like and they seem to come apart (in a bad way) more easily. Overall, though, I generally use whatever knuckle coupler comes with the car or loco.
If I'm building a craftsman kit or replacing the big rapido couplers, I use MicroTrains as the replacements.
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