I have a Tetratec DW12 and it works great for me, I just found out I have to tighted the screws on it once or twice a year to keep it quiet but I don't hear it at all unless I'm right next to it. It's almost a year old now and still works great. I have a different design then the one in the link but mine works great.
I hav a tetra-tec air pump 4 my tank and it works brilliantly extremely quiet and very efficeint just make sure u get all the necessary parts cause the tubing and stop valve do not come with it but it works well once u get it all connected !!