Heads up for Xbox 360 users. Rockstar recommend that you dont install the second disc as it will negatively impact performance. The PS3 only comes with one disc. http://www.destructoid.com/rockstar-don-t-install-second-gta-v-disc-on-360-261936.phtml
Its top class. Being able to switch between characters adds a whole new element to the game. For example, whilst on a mission you can choose to be the driver or the shooter etc.
Think i'll avoid watching videos, dont want to ruin for myself. I've watched leaked gameplay before and I always say i'll only watch one or two but I end up watching loads.