I use them on a west facing deck and they seem to work well. I do water from the top still on really hot days, I figure more water is not going to hurt anything. When it rains or I over-water, it just runs out the overflow, through the deck, and onto the patio below. My deck is cedar and I stain it every spring, so whatever water damage might show up is addressed in the spring clean-up. So far, it's been minimal. I plant annuals (snaps, petunias, colorful stuff) and decorative grasses in the containers.