Does anyone recommend or have tried the cat nail caps? Which brand if any would you recommend?

Those crazy colored caps you can place on your cats claws, do they work, are they harmful to kitty, what company would you buy them from, how quickly do they fall off, how easy are they to put on? etc? etc? etc? Any info basically would help! My kitty is terrorizing my body (hands, feet, arms, legs, body!) and my furniture! I’ve had more scatches in the last 2 weeks than i’ve had in my whole life!