Just to clarify since some of you just love to troll other people's problems.
The 4th MacBook Pro IS a magnificent machine.
About the Audio issue; The First MBP was way worse than all the rest. It was worse than the one in the store.
The second computer still had a small hiss. I didn't know this was normal since all other computers Ive ever owned and worked with (Network Admin, I work with a lot of computers) has never had this issue including my Black Macbook. On the second exchange, me and the Apple Genius were standing at the Genius bar doing google searches over the issue, and found that there are so many people having this same issue. He suggested that i buy the filter to raise impedance so i left. I have tried many different headphones/headsets on all of the notebook, so you can't hate on that.
For all who said I should have just been happy with what I had and all the problems I had were minor/ignorable are wrong. If you buy a brand new product, It should be perfect. If you buy a new gun, you expect it to shoot right, or if you buy a new car, you expect it to drive/look/feel right. Same goes to the computer industry.
As a PC user for most of my time and never experiencing an audio "hiss" in any of my notebooks, when i first got the MacBook Pro, I thought something was wrong with it.
Apple did do everything they could to help me out, but I do not see any way that I was out of line. I paid for the computer and I should get one without flaws.
I love apples warranty/replacement program and have always bought apple care since the first iPhone. (I'm an avid iPhone fan)
IMO apple is number 1 in support, but just like with anywhere, you can either get a person having a good day, or someone who could care less about your problems.