I've had my xBox 360 for nearly three years and its never broken down or had a fault yet. I find it strange that I've never had any problems given the horror stories I've heard and I play it for hours everyday. The best thing to do is to weigh up your options, you'll be getting the slim line in three weeks you say? Can you wait till then and simply trade it in as planned? I doubt many people will be buying the old xBox anyway some may be sold back to Microsoft for parts, it's not unheard of.