Pros: The continual supply of running water. It seems to keep the water cool, fresh.
Cons: It began making noise and became very annoying.
I loved this device when I first started using it. I have 3 cats and 1 dog that all drink from the drink fountain. All my animals share the same fountain which makes for less hassle for me. There is a water reservoir which allows me to add water less frequently; however, I would prefer the reservoir to be larger than it is. With 4 animals drinking from it, the water is emptied pretty quickly. The cord that is used to plug it into electricity is rather short, which minimizes the places you place it unless you an extension cord (which is very dangerous especially with water near). It began making a humming noise several months after I began using it. Over time the noise got louder and louder. Eventually, it became too loud to deal with. When it was not making noise, I thought this was the best product ever. My animals liked drinking from it. It provided them with clean, refreshing, and somewhat cool water. My pets always drank from the stream, not from the bowl part. This is how I know they liked it better than just a plain bowl of water. If they developed a new model of the Drinkwell Dig Dog Pet Fountain, I would purchase it.