Quote from dwl603:
The book on the ETF's is total bullshit try to hit size 5-10 ticks out of market and you will miss atleast 70 percent of the time, this is because (in my view anyways) it takes time for an order to route at each level, so for example at 93.41 there is 200 on arca 200 on nsdq and 200 on edgx well while the arca order is trying to route to edgx and nsdq cause it has to take its shares on .41 before it hits the next level, the next level has time to pull so you miss the size quote you are trying to hit.
You are right though i dont imagine there is much of a difference between the different "ONLINE" brokers like you would not see much of a difference between scotttrade or IB just try to find one that has a way of sending the shares you want to everything all at once and cut down the size......
The way i do this is if i want 12k shares i turn it into a 5k share order but send it to 5 ecns, all at once.