had the opportunity to handle one... I like the layout of the center post... altho the one I looked at was a clone, ( no name box) I did find one issue that kept me from getting it. The lower metal portion below the Oring on the base was a bit too wide, once you pushed the sleeve all the way down, it was impossible to move it to change the airflow. Thinking it may have been a dry Oring causing the issue, I removed the Oring and tried it again. Same issue... the tolerances between the sleeve and base are too close.... its almost a press fit
Make sure that the O ring is the red one. The black one is too large and you do have to position the holes before you snap it into place. With the red one, it's still a tight fit but can be adjusted while in place.