Really pleased with the quality of the stitching and material. The rubber gasket keeps the caribiner from rotating, and also keeps the caribiner from moving side to side.
I bought some BD oz quickdraws the same time I bought the WC Helium quickdraws and the dogbones where both dyneema, but the quality seems to be much better with the WC dogbones. The rubber insert is thicker and the dyneema seems to be more durable. With that said, these differences are not enough to affect climbing. I do the the loop at the end of the longer BD dogbone, since it offers room for the biner to move on trad routes.