I graduated a year ago from KPA. It did teach clicker training as thoroughly as possible, the workshops were awesome and the people were knowledgeable. The internet content was lacking however, but my instructor helped out a ton if there were ever any questions. It is very PR, I got in trouble for saying "eh-eh" to Zuma during a workshop when she snapped at another dog. I firmly do not believe that you can become a good professional dog trainer by solely attending KPA. Some kind of apprenticeship with a respected trainer that you idolize will fill the holes that KPA leaves.
So all in all, if you want to be a clicker trainer there is nothing better out there than KPA. Best option is to find a trainer to mentor under.