Just got a new rMBP 15" almost 2 weeks ago. I noticed yesterday that, when closed, does that black hinge thing on the back wobble at all? it makes a creaking sound, and i can wobble it very noticeably. It's very obvious there's movement. I didn't notice this on the notebooks in the store, but then again, i never closed the laptops in the apple store and carried them around. i noticed it when i closed the laptop to carry it and felt the movement in my palm. i hope it doesn't get worse over time. my 14th day is in 2 days and wondering if i should swap it out for another one. i really like this one though...decent battery life , doesn't get very hot, and ok screen.