I am using a two step and footbraking in my car, I found it to help with consistancy in my reaction times due to it letting you leave at the same rpm every time and you can vary your launch rpm consistantly. Just strait footbraking you either have to watch your tach too get the rpm the same every time or do it by ear, this leaves too much room for human error in setting your rpm at launch. Though not as consistant as a transbrake with a two step would be, using a two step while footbraking does take one more variable out of it. Just my two cents for what its worth