did you actually look at the spread he was talking about? that one in particular has nothing to offer and when you have edge the limit order isnt about slippage..its just a place holder. When you are slow and late to the limit game then you lose more than slippage you get legged.As I always use limit orders slippage is not a concern to me. It moves really really slow, you have enough time to manage your positions. Manual spread trading is highly profitable.