So, I'm considering these brushes ( and their necessary gathering chains ) for my Drago series II - 8 row header this year to help curtail some of the worrisome header loss we have in dry corn. Can anyone tell me the "Pros & Cons " of these chains/brushes.....will the brushes last a season(800 acres of field corn) ? Thanks ! Whats the cost per row ? How long does it take 2 people to mount the brushes and new chains one one row ?