Be it cheap car child seats or for those with budget the more expensive one, to have one is better than none. Also for new buyer, check, there is expiry date for car seats ! every Driver thinks they are careful when on the road with kids/toddler, be it an expert in driving or casual, its more on other drivers whom is not careful to cause an accident or some big animals running across ! So be it a cheap car child seat, does not matter, invest in one.

Yes, it's mainly made of plastic the frame, with heat in the car etc, the plastic strength will deteriorate.

Try checking out those graco, britax at the back, look at the plastic frame, there is manufacturer and expiry date.