Product review (4 stars): 1.0 sones or .6 sones?
I thought I ordered a fan with .6 sones, but got a fan with 1.0 sones. The confusion came through finding the same model number on different sites. Just make sure you get what you want.
That said, this fan is much quieter than the rattletrap it replaced. With an old house, I had a lot of expensive problems getting it installed, but that's not a fault of the exhaust fan.