Has anyone tried the Zaner Group? Their commissions are low and they use Trans Act too. I pay $1.50 R/T in commissions. You add $2.32 and $1.86 for exchange fess R/T for ES or YM to that. And more volume means they can go even lower.
I like Trans Act a lot. I have been using it for a while now and have no complaints. They are very quick to answer the phone and their platform is very fast and reliable. Try IB's customer service and you will know what I am talking about.