Model Rectifier Corporation (which uses the trademarked logo MRC) is a long-term player in the model railroad electronics market. It now has entries into other markets.
MRC was a pioneer in N-gauge sound decoders.
MRC has been marketing DCC systems since the early 2000s. Popular for their low entry price MRC's offerings are limited in scope.
Without extensive experience with them Bruce doesn't want to opine or discuss features and nuances.

