Let me say one thing about this.Quote from local_crusher:
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With the new unbundled comm. structure IB is now more&more a target for real high volume traders who got used to X-Trader, you just can't compare the two interfaces when it comes to "the feel of speed"
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In the past , I have many times written about the nice way IB makes everything available you need to know about API on their web-site. They even have their live demo that you can test whatever you wish to. (They are not that great yet with FIX, but I hope this will still come. A lot is there but not enough documentation/example code.)
This is the only reason I have not gone with X-Trader yet. You have to literally pull the info out of TT, many of their participating brokers don't know a iota about X-API. They never seem to have heard about unix/linux (client-wise) yet. This will change the day TT gets wise and releases a linux API, unfettered by fat unnecessary go-in-betweens. This is, I guess, less or more what many people think around here.