I had a terrible experience with the new 15" model. Mine had obnoxiously loud creaking, to the point where it seemed like if I carried it wrong, it would break. Just sent the machine back for a return and am looking to purchase a new machine. I am now considering one of two choices: 1) Purchase the same 15" model and just replace the machine until I get one that I'm satisfied with. 2) Purchase a 13" (only if the chance of these issues arising is lower than on the 15") Please share your experiences!