I have a sicce , and it was dead silent for a long time. It makes a little hum after 5 months, but I probably need to run it through vinegar. I ran it through bleach and that didn't help much . If I had to do it again for the price, flow and pressure , I'd still probably stick with the sicce , but up sized one more as I hadn't planned on running as much off the manifold . Also I believe over time flow decreases somewhat with gunk. I would reccomend the sicce, otherwise I'd consider the coralvue DC pumps as a cheaper alternative to the vectra .