Simple answer is yes they are a wonderful invention that works great.
Long answer I have 2 on my 75G closed loop. Before adding them I didn't have all that much flow and was seeing issues of settling. I added the penductors (they are all the same, just different design) and left the lines in the direction they were pointing. Fired up the pump and sandstorm all over the place. The flow was at least 2 to 3 times as strong and I was using a Ocean Runner 6500 as the pump. After some adjusting of the loc line and aiming it AWAY from the sand, all was well. The flow pattern is a more directed pattern, but it does create turbulence around the penductor as well because it is sucking in extra water from the sides. All in all, they allowed me to have enough flow for pretty much any coral with a small closed loop system. I do not have one on my return, but I may on the next build.