Anderson Camper Levelers, anyone use them, do you like them?

Would it make you feel better if it had a different name on it? Camco make a similar product, maybe it’s a good idea from them?
I agree I haven’t seen these in a campground yet but I rarely look at what others use to level there camper. Personally I am thinking of trying these out after looking at them. Being plastic there is the possibility of them breaking, I have broken my LEGO blocks in the past.