See <a href="http://motls.blogspot.co.il/2015/05/relaxion-new-paradigm-explaining-higgs.html" rel="nofollow">http://motls.blogspot.co.il/2015/05/relaxion-new-paradigm-ex...</a> - the ratio between Plank mass and Higgs mass has to come from <i>somewhere</i>, and Motl isn't convinced that the source in this model is particularly more natural.