I dont think its too noisy, I cant hear it driving. Hell I occasionally try and roll the windows up when there already up at a stop light, just to hear if the tone changes on the pump. With my pump pushing 14 psi I never know when its gonna finally go out.
I had one it lasted about 6 months.... I thought it was too loud. I have since installed the new holley HP150 that is designed just like the BD gerotor design. It has been on my truck for over a year and silent and works great. Bought it at Summit racing around $200 I think, just my thoughts