I have had this for four months now and it has only had to "work" once. It was okay. Better than free-peeing on the memory foam seat but not a catch all either, and my kid is not a heavy wetter. It is not very comfortable for her to sit on and she's constantly getting it stuck to her back. If your kid seems likely to pee in the car seat a lot, I suggest putting a diaper on them for car travel and skipping this. Also it traps food underneath and stuff sticks to it and it is generally gross. It moves around and is annoying. But it does more or less do the job.