I originally bought Perfect Pass because my pitot tubes in the Delta were clogging every five minutes, due to so much plant life floating on the water. Once installed it never skipped a beat....ever! Buy it you will not regret it....ever!
I boat in the California Delta, which has a significant hydrilla as well as other water plant problem.
I have fouled the pitot tubes more times than I can count. I have fouled the prop a couple of times to the point I had to dive over and clear it. Once I fouled the cooling water intake and burned up an impeller.
I have never had the paddle wheel for the Perfect Pass foul.
I also have a big cruiser that has a similar paddle wheel speed sensor. Because this boat sits in the water 24/7 things tend to grow on the bottom. A couple of times I have had to pull the paddle wheel and clean out the critters that have taken up residency in there. A very simple process, I can do it and get the paddle wheel reinstalled before the boat sinks! I have never had need to remove the paddle wheel for the Perfect Pass, but I would guess it would come out just as easily.