These little tools work exactly as promised - cleaning up excess and leaving a smooth, professional-looking line of caulk. I used this to finish caulking my kitchen tile backsplash and it was perfect, even on the inside corners and under-cabinet edges. Each corner of the caulking tools has a different angle or size to match any job you may have around the house. They are easy to use and to clean up. I noticed that one reviewer noted blue marks from the pliable plastic. I only had one of these when I pressed too hard, and figured it out right away; I was able to remove the blue mark. Also, the plastic is soft and can wear, but I use a sharp blade to recut the angle or take off little crumbs.