So I really prefer the double walled metal waterers. They are study and the filling method is more efficient. With this plastic waterer, you have to wait for your chickens to run out of water or dump out the last bit of water to refill it. That bothers me - I don't like wasting water. But the top fill plastic waterers break. And I need to give my chickens apple cider vinegar. So such is life. As far as plastic waterers go, this one is probably the most reliable one you'll find. Reliability beats convenience for me. I can't have this thing breaking while I'm at work. It does tip and spill a little, especially when flipping. But I have yet to have it come apart while flipping it over. As the waterer gets closer to empty, the more likely it is to tip and spill even when hanging. So you have to keep it relatively full so that the weight of the water keeps it steady. Unfortunately, you can only fill it when it is empty unless you want to get a little water on you. So it's up to you.