I started using a blinder last year because I always had to wait on the 3rd yellow or I'd be red. It will slow your reaction down but make it more consistent. If you race NHRA the max size a blinder can be is 8"x4" so it won't work for both lanes unless you have a slider. If you night race much you will have a hard time with a blinder because you will see the other two bulbs no matter what. I've been pretty successful with it but every once in a while the blinder bites me in the @ss. Some people can do it, others not so much. Hope this helps!