Wow!
We turned Miss M at around 6-8mths. She fit all the min requirements, and she hated the seat facing backwards. Once we switched the seat round she was so happy. At that point in time that is all that mattered to us. A crash of any description was the not even in our thoughts at the time.
This time round Miss H doesnt seem to mind being backwards, I think that she can see and play with her sister so shes happier. So with this been the case we will leave her rearward facing until she either hits the restrictions on her seat, or car rides are no longer enjoyable for anyone. ITMS.
I know saftey comes first but also if they arent happy in their seat rearfacing, and you've done all you can to keep them happy, but nothing works, turning the seat round is the better option. ITMS!