OK gang, I'm starting this thread, and I want to hear from everyone. With Tradestation's reduction in commissions, I am strongly considering going with them vs. IB. The commission costs are virtually the same now, and the ability of Program Trading and current and historical simulation gives Tradestation a big plus over IB, IMO. I like IB overall, although they have gone down at crucial times for me in the past week, which seems to be atypical, but was quite frustrating. I want to hear from you guys out there - IB vs. Tradestation - why would you go (or stay) with one versus the other. Are there any other discernible features of one vs. the other ? Any real cavities that one has versus the other ? Thanks in advance for all opinions.