Well I just took a big chance. I went ahead and purchased the Quad Mt. Vernon AE. Am I crazy or what? Anyway, it was between this unit which has the new control board for 3000.00 or they had a left over Mt. Vernon for 2300.00. The mt vernon for 2300.00 was noisier and the AE was virtually silent. My logic is this: I am the kind of guy that if I didn't get the AE, I would always know that there is a unit out there that is potentially better that I chose not to get because of some issues with it. I'll take my chances. If there are some issues, the service depts tend to slow down this time of year and they will be out to the house if need be. Can anyone help me sleep better tonight and tell me they love their AE? Thanks for all your help on this board.