i used benevit it is from the feedmark range and it is brilliant and even if you are feeding twice a week it would be worth it, my horse was on it and then when he went away last year to be backed and he wasnt gettin it and he came back and i could see the ridge on his hooves where he had stopped taking it they were smooth and strong on the ends but rough and brittle on the new growth i would so recommend it, down side it isnt cheap but it does last a long time.  its the best stuff ive tried i know a friend who also use the hardy hoove formula and they swear by it but i cant give any personal preferences on that.

hope that helps