I bought the Pioneer Pet stainless steel fountain (the smaller version of the two, with a ramp for the water.) It doesn't really make any noise, but all 6 of my cats use it through-out the day. I'm very happy with my purchase! Even Isabella, who came to me at 6, having never seen a fountain before, dove right in, so to speak. Different models have positives and negatives. This is definitely a great fountain, IMO!