Well I just came back from the apple store today and they wouldn't let me exchange because the mooing doens't hamper the funciton of the laptop. this is my second macbook and the moo IS A LOT quieter than the first so I really didn't care. I'm happy because he fixed my G key tho lol. If you've got a moo you should still try to return it, especially if it's a loud on tho. I'm pretty sure if I nagged away for an hour like last time I would hav egotten my way, but for now I'l just wait for the firmware since this isn't a big issue ( damn this new g key feels so nice. it's like I have a brand spanking new macbook).