I've bought 3 of these harnesses and they are truly excellent. They are super easy to get on and off, allow full mobility for our cats, and are impossible for them to squirm out of. At any price-point you will not find better harnesses than these.
Our cat is extremely nervous and wary. He is a rescue and is still worried about everything and everyone. He comes to the door when he wants to go out and accepts the hoster easily.