Some say they make a difference, some say they don't. Some people are capable of pushing a bike to the point of benefiting from one and some arent, or choose not to. Some can tell a difference and some cant. Some dont install them correctly. Fork braces are like oil and Moly threads. You have to take in all of the opinions and form your own based on what makes sense. To me, the theory of stiffening and choreographing the movement of the forks makes alot of sense and for that reason, i will order one when SuperBrace makes a run in the new year. One must also keep in mind that following the theory of how it works, proper installation is critical, meaning that rather than just bolting it on, one should loosen the axle pinch bolts, install the brace and cycle the forks up and down, then retorque the axle pinchbolts. I think that failure to do this could cause binding/stiction in the forks, leading to a negative review of the value.
I THINK they are a good idea but have no evidence to argue one way or another. I will let you know in the spring