Well lets see...The last time I sent my DA in due to it impacting the ground it cost $17 shipping and that was it. They called me at home to discuss the motor one on one.
The last time I dealt with a manufacturer here who has a support forum it cost $300 and I will never deal with them again, nor would they answer their phone. ( maybe they were online drumming up sales).

DA states in their manual they would rather deal with you in person and based on my experience thats fine with me.