I had a RIR that we got as a chick with two other birds (BO and PBR). Of the three, the RIR was definitely the most easily stressed and did not like being held. She also got loud as all get out as she grew, to the point where we had to rehome her because I didn’t want our neighbors getting annoyed with her constant loud squawking. We now have a 10wk Cherry Egger (which my research says is just a “fancy” name for a dark red RIR) and she is also prone to be more skittish than her coop mate. No negative experiences though other than the gosh darn squawking.