depends on you and how you react to it. works for some, doesn't work for others, but it does work for me and a couple friends, so we can vouch for it (:
Wrong every one can use idose it's just harder for others to concentrate it took my friend 4 months before he got it it took me a couple of days, it took another one of my friends a whole 6 MONTHS! but like i said it's different for every one as far as i know EVERY ONE can use idoser its just concentration