I've had problems with IBs "Smart/Best" routing. With a posted bid of 1.00 and autoex on, I will enter an order to sell a few contracts at 1.00. About half the time, I get routed somewhere else and then posted. Most of the time, somebody will pick me off after a few seconds, but other times I sit for a long time til the bid is going to cross me, then I get filled - or the market moves away and I have to chase it. I've cancelled and resubmitted only to be routed to the same exchange again and again using BEST/SMART. I've contacted IBhelp and they've not been able to give any answers - they've referred it to the programmers - but this has been going on since I've been at IB (about a year). Up until recently, I could just re-enter and preference the exchange with the best bid. Now that I have to pay double to do so, it's no longer attractive. It seems that if they are going to give financial incentives to use SMART, they need to ensure that it really is "smart". Otherwise, I'll keep locking the options market. Anyone else have this experience?