There are many kinds of headhunters in the market, so when you decide to use one,

  you should consider the below 3 criteria

   1.    Can the headhunter address your requirement of accuracy to search out
          the fittest candidates？ 

    2.   Can the headhunter satisfy you in terms of speed to search out the
          candidates within  the shortest time period?  

   3.   Can the headhunter represent you to promote your company, your hiring
         manager and the opening?