My sensors have always worked well. Over 17 years and two TTs (TT before that was too old for sensors) I have not had any issues.
But, I do not use my TT the way most here do. I always boondock in remote locations and do not dump until I get home. I also use bacteria/emzyme treatments that basically disolves the black solids.
That and many miles of rough roads mixes up the tank contents really good. I do use a clear attachment that allows me to see what is coming out of the tank.
Most here use campgrounds, and dump there before returning home.
Those tanks will have stuff in them that isn't disolved. Knowing how the sensors function.... That WILL cause problems.