jah!
they are a bit if a pain, you need a SFN as per normal, you then clamp the separate cup thingy loosely to the top of the steerer with the SFN, and then you bolt the stem to the cup with the three bolts, and then (!) you tighten down the SFN nut which will expand the cup into the stem and tighten, and then you tighten the other three bolts.
Simple!