Doesn't work with *all* saws
While the idea behind this device is sound, it doesn't work with all circular saws. My Porter Cable 20v cordless has the motor on the other side - the right - of the blade, so it is not possible to position the Square Cut so it will work. I will use it with my jig saw, though, so it isn't a total loss. If I acquire another circular saw, with the motor to the left of the blade, I am sure it will be a useful tool for making cross-cuts.