Yeah, that seems to be a unique design in the BMW control arm bushing world. So far they seem to be working as advertised. We've been running the car pretty hard at recent autocrosses (4 different people drove it last time) and everything is holding together and doesn't appear to have any excessive wear and tear. Except the tires
I will say that they were MUCH easier to install than it was to get the old ones out. There's no metal ring around them like the stock ones and we just wet them and popped them in with a vise.
Edit: I just read your original post again to see that you also have the Powerflex bushings. Are yours the centered ones? These are the offset type and that could explain the different appearance. From pictures I've seen the centered ones are a one piece design.