Straumann has been milling some custom abutments for me lately . I've also tried their zirconia. I have to say that the quality has been consistently sub par at best. The shades a very poor .A2 looks closer to A4 which is unacceptable. However the custom milled abutments have to be the worst I have seen. I'm no expert on milling but the tool marks are coarse with gouges.They are very dirty with residual metal flakes in concave areas and unpolished. I have used Argen in the past and find their abutments cleaner and well polished with retentive grooves. Did I mention the price for an original Straumann abutment is $45 dollars more?