Oneof the unfortunate side effects of a defect like this is that the problem turns into an urban myth on the Internet. Soon anyone that has a machine of the same vintage, regardless of whether it's actually effected by the issue, will start to obsess about whether it effects their particular machine. So, the issue sort of takes on a life of its own, and effects perception of that model.
Personally, I wouldn't sweat it. The machine is covered by warranty for a reason. If the problem happens, just take the machine back and have it serviced.