Hi,
I trade using IB, to be honest smaller margins would be nice, BUT in all fairness I'm very happy with them. The high margin rates have helped to keep my trading in check from falling to my emotions and carrying a large position over night. I really just try to scalp but do carry an odd one or two contracts over night - something I've cut way back from doing but still do it, if that makes sense.
I feel my account is safer with them because they are soo tough on margins.
I do have a good size account (for me anyway) which in the years of trying to make trading work I feel you have to have. I can safely scale in up to 6 contracts if I needed (I have enough funds to do more, but have not passed 6 yet, and have only done that a few times,) without worry of not having enough funds.
As for commissions I trade close to a 1000 RT (avg) a month, which I just switched to the unbundled pricing and I'm at $1.92 each way for this month.
I use them for their charts too, which for the last couple of months I've been very happy with and all I need for my style.
I still use their reg' order entry system, I think their book trader would help add a few points here and there because of speed on entry and exit, but honestly I don't want to start changing how I trade yet, at least for a couple of more months till I feel I'm still making it.
well that's enough waffling, just wanted to share my thoughts on IB, for what it's worth
Happy Thanksgiving,
Andy