they work well. however, best not to mix rulers for your routine measuring and cutting. I feel it is ok if getting a speciality ruler such as triangles, etc but best to stay with one brand for your routine cutting. Why??? Because not all rulers are the same and measurements are sometime slightly off. So one must know the quirks on the ruler.
Some marks are wider than others and could give you less or more space in the cutting.
I hav learned to alighn the mark on the left side (greater) side of the mark. This gives me a better and full cut. Cutting on the smaller side (usually the right) could cut off your scant 1/4" in piecing.