I just wish you could find the people who buy the seats so that you can warn them about it! You should have seen the crap my Mom bought used for my older neices. I told her every time I saw those thing that they would likely kill Katy and Brooke in an accident, but she wouldn't listen. ARGG!!
Until I got pregnant, that's when I told her that my child would NEVER ride in those seats and NEVER ride with her unless she got her act together. Now that she has my nephew, who is 3 weeks older than my DD living with her, she HAS got her act together, has brand new seats, and is always checking to make sure my sister has her DS strapped in right. I still haven't sent my DD alone with her yet though. Katy and Brooke's seats are just too fresh in my memory. The only times my DD has gone in car without my DH, or myself, has been with my best friend, who is also a regular on this site, and is about to get her carseat tech licence.