I'm coming from 2013 a/c pumps so I am blown away by how many improvements have been made on this product. I now have to of these replacing my Sicce Syncra 2.0 return pumps. These are dead silent when running, the low, sometimes loud, hum or buzz is gone. I only hear something when when they are turned on or off. Loving the ability to control the pumps with my phone, also the programming including the "feed mode". I can't say enough. I had to reach out to Sicce Support during this replacement, they were awesome.