E Revo center diff kit: part #7014 Anyone tried this?!

I've been looking for some new worth while mods for my 16th scale e revo, when i came across part # 7014 as can be seen here:
http://www.traxxas.com/products/electric/erevo7108/trx_erevo7108_accessories.htm

So my question is, how many of you have tried it? is it worth it? I was thinking it might help put more power to the ground.
Thanks for all input!

man 6 views and noone says anything?

someone give me some input, im going to do a how to tomorrow i think