Im running TOS and IB at the same time and IB has much tighter markets on spreads,they show the bid / offer and size..TOS does not. What bugs me is if A spread is offered mid market,IB shows it where TOS does not. I believe IB also reroutes orders if a better offer or bid comes in,TOS does not.. There are alot of things I like about TOS.but trading spreads is not one of them..