i originally switched to it because i hurt my shoulder hitting joweee in our last meet. reverse grip doesn't strain the anterior head of the shoulder while putting a lot of emphasis on the medial and posterior heads. i started doing them to help rehab my shoulder and have stuck with it to see how high i can go on them. as a result my shoulders are balanced now.
my tricep strength has increased greatly and my shoulders are now balanced. i've been tempted to see how high my regular bench is but i'm going to wait until after my comp.
to answer your question, it can only help your bench because of the overall shoulder balance the exercise brings and the the high amount of tricep strength that you develop. i'm think'n that i could hit 520 on reverse right now and my regular bench would have to be around 550 right now.