I have 4 RIR and 2 BO pullets, and 1 BO cockerel . The RIR's started laying around the 24 week old mark, but it is Winter here so I thought that wasn't too bad all things considered.
As far as their nature goes, they seem fine to me. They are not 'cuddle me' birds, but they are tame enough to eat from my hand and will follow me around the yard quite happily. They have never pecked me or flown at me, flapping. They sing the egg song for a minute or two when they lay but are otherwise very quiet in comparison to the BO's.
When I treat the birds for lice or injury, the RIR's are easier to handle than the BO's. They are a little skittish to catch, but once caught do not struggle or fight with me - they just lie there are take whatever I have to do to them!
With regards to eggs, they each usually lay a large brown egg, 5-6 times a week. I have only ever had 1 soft-shelled egg from one of them, otherwise they are perfect eggs.
I am enjoying this breed, and now that one of my BO's has gone broody I am giving her the RIR eggs to hatch for me. They have been such great layers and are low maintenance. The BO's have been a bit of a worry, with lice, injuries and broodiness, which seems to be their default setting! (They are sweet though, so that kind of makes up for it!)
Krista