Bondtech AB is known for their top of the class extruders. They are also known for their excellent customer service. I´ve had brief contact with Martin Bondéus over the years and recently they decided to support me and my projects with two Bondtech Extruders for my BCN3D Sigma 3D printer.
I have done some beta testing for Bondtech in the past but this is the first time i´ve had the chance to use the finished product and it really does take the 3D printer to another level. It will be interesting to see the results over a longer period of time aswell.