Insufficient for option traders
Critical features like OneCancelAll, not available for option spreads / combos. eg could be in a spread at 1.00 debit, and want to sell at 2.00 and simultaneously set a stop at 1.50, so whichever executes first, it cancels the other. Critical for anyone who cant be at his computer screen 24/7.
OCA feature, available for single legs only. Anyone with even a little experience in trading options, would trade spreads / combos, rather than single legs. Suggesting only inexperienced option traders use IB.
IB only allow one option chain to be opened at a time rather than multiple.
RAM hogging software, even with nothing extra open and can take ~+10mins to open after log in details entered.
Commissions should always be leg, esp considering there are expensive cancellation fees ~>$1 per leg for single leg trades, lack of available features and facilities to trader.
This is not criticsim for the sake of criticism, but we want IB to be one of the top brokers for option traders. Currently, its average at best.