I have one that we use on our pond. I will say that they work great if anyone is thinking about getting one.I have been using aquacide pellets and the the weed razor to get the curly pond leaf . Finally been able to keep it looking nice.
I looked at buying one for around the dock. We have a lot of coontail, it would be nice to have a swimming spot that's not covered in weeds. Do you still have it? We could pass it back and forth if your pond got weedy again.