The harness is good, my cat likes it too. He doesn't try to take it off even inside the house. It goes on quite easily, it's adjustable (from 3-4 kilos when he was smaller and now he's 5+ and there's still room). I got him a retractable leash so that it's not restrictive like his own which has a fixed length.

I wouldn't say it's one of the best. Without stressing my cat too much, with a little bit of 'attitude' she got it off very easily.