Sorry I had been under the weather for the last week and have not been following the forums.
Mine makes a lot of noise when the machine was cutting small parts like Dpot wrote. Mine does cut rather slowly because of using 1/4-20 allthread. It was handy and cheap what can I say.
The only other times I had problems with it is trying to cut a lot of intricate movements which makes a lot of noise as it makes the steppers change direction and speeds a lot and noise.
My previous driver program was GMFC and the end result is similar to any other cutter as for the ammount of noise.