I have had mine running with no problems, with the wider flow it DOES reduce the overall strength of the flow, by approximately 10-15% give or take. The wide flow is Much wider than that of the stock. I ran 2 wide with anemone guards (see image) and 2 stock, the flow was nice and wide. I did a bubble test and the flow pattern from the cone is appx 1.5 to 2x wider than the stock. I have a peninsula and chose to run 4 mp40's to prevent having to use 2 mp60's and damaging coral too close to the pumps, and the wide flow adapter made it even smoother for the corals on the pumps side without affecting the overall water movement on the display end of the tank. So much so the anemones hang our closest to the pumps side.
By the way, for as long as I have ran them there is no noise coming from the guard other than the standard humming of the dry side. The 3d print was exact and clicked on tight with the wet side. I might have to get 2 more to interchange while cleaning them out. The anemone guard did save me 2 times already, had my 2 nems split into 12 and sometimes I fish em out to the fuge, but the nem guards really did help to prevent them getting chopped up.