Thanks for this thread, I think it's an issue that could do with more open discussion.
We got a Britax First Plus before Jack was born as we wanted to save money by having a car seat that would last, rather than forking out for an infant carrier and then another one in a few months. MIL insisted we have an infant carrier so she loaned us one and we used it in my mum's car but Jack outgrew it by 3 months (I was right lol!) Anyway, it's only since I learned about ERF that I realised the weight limit on the RF position is a problem
I hadn't talked to DH about it yet when he raised the topic recently, saying we "should" probably turn Jack around soon. I practically exploded at him! But it's not his fault, he's just going by what he thought was safest - as the weight limits would imply. I had to explain that the 20lb guideline is an absolute minimum and children should RF as long as possible