Having had MacBook Pros replaced 4 times in the past, I was never asked to sign a NDA. All I had to do was release interest in the machine, and sign that Apple wasn't responsible for data loss/failure to wipe data. FWIW, I had an Early 2011 MBP 15". I went through, like, 8 logic boards in the first year all due to the GPU. I was constantly at the store for video problems again. About a week after the 1-year warranty ended and I purchased AppleCare (about a month after the last logic board replacement too), I started having video problems. Took it back, and got a 2012 Retina 15" to replace it and Apple had me pay a hundred and some-odd dollar upgrade fee.
That machine had everything replaced within a year, plus 3-4 logic boards for GPU problems (ironically it was in the same recall as the 2011), and was replaced by a late 2013 discreet GPU model. One year, 3 logic boards with dead dGPUs, an external casing and SSD later, they refunded me the value of the late-2013 model and I bought a nMP.
Long story short, don't buy a MacBook Pro with a dGPU. From my experience they are nothing but problems and your local store will end up hating you, like mine does me. If would like the full story, please check out my blog in my signature. I talk about the whole thing, including the iPhone 5 I was dealing with a the same time that had 14 replacements.