Has anyone ever used this product and does anyone know if it works?

http://www.amazon.co.uk/gp/product/B004WWSRE8/ref=s9_simh_gw_p200_d1_i2?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-2&pf_rd_r=1436Y27CA8KKCDYACD0N&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294