I am considering purchasing a used Rayco rc6dv ... Looking for input / reviews of current or previous owners of this unit.. I am NOT looking for reasons or advice to get a bigger chipper as I have reasons for wanting this compact size. Mainly looking for comments on the Rayco rc6dv chipper's durability and its usefulness in chipping branches in the 4 to 5 inch diameter range, including harder wood such as Oak..... OR ....... suggestions on another brand and model of chipper in THIS SIZE CLASS thanks..