I have an aquatop 400, silent as could be. I never hear it all. I don't have the UV one, just the regular, I have never had any problems with it at all. And it's really easy to add whatever media you want to them. I run filter pads and bio balls in mine. Then if I ever need any chemical filtration, I can just throw some carbon, phosguard or anything else in a bag and throw it in. VERY versatile and silent.