I was told the Corally blades are working on the stock bones/pins. Jürgen has made now some Teflon blades which should be good also but from what I know they are brandnew and untested yet. But I just have the picture I posted before not any diffs yet. So I can´t say anything from experience. But Jürgens products are topnotch usually. I know some guys had the frontdiffs since some time but there was some development on the diffs so the blades are used now.
I have planned going to a big indoor race tomorrow maybe I meet one of the guys using them.