Those hoops for the seat catches are a lot stronger than they look  

   I'm no automotive engineer, but I imagine they have to be strong enough to keep the seats locked in place during an impact, especially in a car with child seat fixings? 
If I'm understanding the comments correctly, are we saying there's a risk the hoops could shear off under cornering loads?  I would be very surprised if that happened! 
Anyway, time will tell I guess.  I totally get the skeptism, but for me as a hobbyist, I like playing around with stuff, whether it works or not, and whether it's good value for money or not  

  We all have guilty pleasures.  Mine is cars, which unfortunately costs a f'ck ton of money which ever way you cut it.