If you're a New Yorker, this is a good deal. It's one of those rare instances where you feel like you're actually getting something back for all the insane taxes you pay. You can go to these free child car seat inspections where officers will inspect your car seats to see if they meet current regulations, are installed properly, and to see that your child fits properly.
If you child has outgrown the seat, or if the seat fails to meet current regulations for any reason, they hand you a new replacement seat. Yes, a FREE replacement seat. They also let you know about the various height and weight guidelines for the different types of seats so you know better what you should be doing. We went to one last month and ended up getting 2 new seats because Raina had just outgrown the seat she was in, and Taryn was very close to outgrowing hers.
Another bonus was free popcorn, hotdogs, and pop. Can't go wrong there even if your seats are up to code.
Check out http://www.nysgtsc.state.ny.us/seat-cal.htm to see when the inspections will be held near you.