Haven't had the chance to test at the vets etc yet but we bought this as the standard cat carriers are completely enclosed and quite small. Our cat is not the average cat and she doesn't like being in enclosed spaces, so you can see why we have had issues with the standard carrier. After quite a bit of searching I found this and thought it worth the risk. She loves it! I found her sleeping in it when I got home from work one day so she is definitely comfortable with it. I'm sure this bliss will come to an end when she is due her boosters in December but I can safely say it is definitely more suited for her preferences so hopefully it will make the experience atleast a little bit less traumatic.