I prefer to fake it, it's quicker and it gives me more control not to mention a lot less headaches.
I'f i'm doing a still shot I'll use an unbiased render engine so... and FG and GI out the box are always problematic with animation, unless you know exactly what your doing.
Dave
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"