I only run PS mills or roto start. I dont get serious enuff into racing to commit to lugging around a bumpbox. There isnt enuff difference between the PS and the BS mills to make it worth it to me, My best bud also has the exact same setup as me, but he swears by the Bumpbox. He can just barely inch past me at WOT and the bottom end there isnt ny difference, we run neck and neck. Hes alot better driver then I am and I know its not the difference there, PS get a bad wrap coz of the weight, but the ease of them makes them priceless to me.