Cutter head was delivered a few days after ordering. Directions were not bad overall, some of the pictures were not real clear as to what they were trying to convey. Removal of the original head and blades and installation of the helix head does take a few hours to complete. New head has been used on maple and oak with a very nice finish. With the helix head it does require more passes to remove the same amount of material as the old 3 blade head. The helix head does take more machine power and does push the machine to it's limit. The unloaded and loaded noise is reduced with the helix head. So far so good, more wood to feed the planer is waiting.