I've probably done about 7 of the main missions, all of which have been really good fun, but I have spent hours and hours on what the blurb above calls the 'in-game economy based on a trading system with fluctuating prices'. This 'trading system' is absolutely addictive. I keep trying to go back to the main missions, but everytime I do I receive an email from a 'trader' telling me he has some commodity or other going cheap, or that he desperately needs some of said commodity, so I speed round to his place, 'trade', get out of there, often pursued by the cops, and spend the proceeds on a new safehouse. I think I've only got a couple more safehouses to buy. THEN I can get back to the main missions, maybe,