These shoes actually do help built your calves and buttocks.  The shoes take some getting used to at first because of their rocking motion (mostly when standing still).  However they DO make you walk correctly.  I like their appearance as well.  Good shoe for a good price!

After owning these shoes for a while they started to lose their luster and seemed to be difficult to truly adapt to.  The balancing thing got worse not better ... ended up tossing them as a bad investment.