Speaking of that FAQ, one thing goes against what I've read: that you can't burn fat and build muscle at the same time. Granted, you gain muscle or burn fat FASTER if you work specifically for each (a ton of calories and little cardio for muscle; a lot of cardio and reduced calories for fat burning), but it's entirely possible to do both at the same time. It just occurs at a more gradual and steady rate. The trick is to keep the amount of energy you expend very close to that you take in.
At least that's what I've read, and it seems accurate in my experience.