Quote from Don87109:
I use OX and am very happy. Their commissions are a little high if you trade less than 10 contracts, but they have an active trader discount requiring only 35 trades per quarter. This discount lowers the cost to $1.25 per contract with a $12.95 minimum.
OX gives me good fills especially on spread orders. Rarely do I pay the full B/A width if I am willing to wait a little while. Several times I got a better fill than my limit order. I once bought a Butterfly for 4 cents even though I submitted a very chintzy bid of 5 cents.
They have lot's of good tools and their phone support is very good.
OX has a very low margin requirement for credit spread orders basically the difference between the strikes. Very helpful.
They also have very liberal options trading capability in IRA accounts.