My Test Results So Far on IB vs Options House for fills: as I mentioned it hasn't been exactly scientific and I haven't been able to que up two trade tickets for every trade we've followed, but I have 6 head to head trades so far (same limit price & spread). In each case I sent IB ticket first followed by OH ticket within 2 seconds. Also I've put in smaller size on each of the IB trades. OH and IB filled simultaneously (within 2 seconds) on 2. OH filled faster on 4 trades (anywhere from 12 secs to 15 minutes). The trades were RUT, SINA (2), NKE, DG, GME. So far OH is holding it's own. But it is a small sample.