Mine have been like an African safari hunt over a water hole. Between 3, 165 gallon tanks, I've been putting 265 gallons of water in them to refill every 7 to 10 days. Rain kept them close to full up until end of July and then we've had .85 rain since then. All kinds of wildlife use them. The closest natural water source is about a 1/4 mile away(a creek and pond) the other ponds around the area are dried up. I have a mid level deer density.
The deer haven't been scared off by my intrusion. The same ones that were using them in August are using them today, and more have shown up.