WHICH ND GRADIENt FILTER TO GET?
 

I need to get a ND gradient filter (77mm) it will be used at times with my hoya polarizer but not all the time.
I found this but i'm not sure if i should get soft or hard edge. http://www.bhphotovideo.com/c/product/567226-REG/Formatt_BF_77_SEND9GHD_77mm_Graduated_Neutral_Density.htmlIt will be used on 3 lens the Tokina 11-16, canon 17-55 and zeiss 50mm. I'm not familiar with this brand. Is it any good can anyone recommend something better? I prefer high quality glass filter.