The biggest issue that I have not seen addressed here is the Live Preview does not use the GPU at all. It only uses the CPU which is frustrating to have a card with 6GB of VRAM and not being able to use it to obtain realtime playback. At first I was excited about Live Preview because I thought it would be more like Premiere Pro where you can layer multiple tracks and play it all back in real time with a workstation card such as the Quadro 4000 or FirePro d700. But in reality its like stop motion animation. Only after you render it (not preview it) can you actually see what your results are. We should all post to the Adobe Forums that we want GPU accelerated Live Preview in hopes that they will add this feature in an update.