I have been using one for a year or so now--works great and looks great. It's lighter than all but the most exotic threaded headset and stem combinations, feels totally solid, and opens up a wide range of modern stem options. It is expensive, so I doubt I would have bought it as an upgrade, but for a totally new build it makes sense. If you're going to put it on a steel frame with traditional diameter tubes, then consider getting "thin" spacers from Velo Orange or Simworks, since these will match the diameter of the head tube and look nice.