A good gearset is quiet. Worn gears can/will be noisey. Poorly setup or improperly broken in performance ratios may also be noisey. If it's noisey, it's not fatal. But I'd want to ride in the car, inspect the teeth and run a pattern on it before I took it in trade.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.