I scored top 5% without LEEWS. Folow IRAC, study hard, know the materials. I know of some fellow classmates who took LEEWS and did not score well enough to make law review (not even top 1/3). I think it is more an issue of self-selection than of LEEWS being the golden ticket to a top grade. In my opinion it is a waste of money and a wste of time that could be spent doing some actual studying.