I have seen them at Hayward shoreline (Bay area). They are efficient at clearing long patches of grass without much supervision. They were bounded each day by a re-installable fence. New location on each day covering approx. 50-60 sq yds. The fence even-though was weak seemed to deter the goats from wandering away. The only drawback i could see is they eat away everything they like which could mean eating rare or endangered flora.