Wide BA spreads in a normal market, and anal raping BA spreads in a fast market. Trades erratically and prone to massive fake-outs. Trading CME options caused a huge drawdown in my account during Feb 2007, when the DOW mysteriously dropped 500 points on one day. Remember that? CME is very difficult to trade because it has low volume and a large share price. My advice is to trade one of the other 5000 stocks on the US exchanges.