Yes, work as advertised (in that you can scoop powder with them!), but you need to develop technique to get close to consistent charges, and you still need a scale to check yourself. I use them in conjunction with a scale, which puts me close to the correct load, and then use the scoop as a dribbler to get exact weight. I wouldn't want to use just the scoop to measure a MAX load, as there will be variations in weight.
If your not worried about exactness, and want a mid-range load for plinking, I guess you can use just the scoop. But I wouldn't use them for anything serious by themselves.