I have had RIR's and here are my observations:
-Production RIR's are aggressive, flighty and just plain mean to others outside of their group (mine killed birds who flew into their fenced yard area and a rat in their coop- yes, killed)
-Production RIR's don't set/brood but are great egg layers
-Production RIR's are really hard on their environment
-Heritage RIR's are friendly but can be flighty if raised by hen mother rather than imprinted by humans
-Heritage RIR's are good layers and will set on eggs and are great mothers
-Heritage RIR's are pretty great chickens
So what is a production RIR? These are the ones being churned out by the big hatcheries as multi-use birds, these are the money makers- they lay well pretty much all year, they make great meat birds at the end of their egg laying career and they don't set on eggs so the egg farmers don't lose money dealing with broody hens. A heritage RIR, you can maybe find at the smaller, specialized hatcheries and breeders. These are the hens that are written about when you read about RIR's. So, depending on your chicken need/wants, I hope this bit of info. helps.