Just to follow up on this for any future sim-to-live convertees who might read this, now that I've "gone live", yes the fills on the Live system do not match those of the Sim system (at least on Open E Cry). As Cruiser indicated, if you practice a scalping strategy in Sim and it looks like it's too good to be true, guess what, it's too good to be true! Trying to scalp 2 ticks from the Live system is like tearing up dollar bills and throwing them out the window. Put in a limit order and watch the price bounce off your limit 10 times without filling, and once in a while it will actually hit, or if the price moves one tick past then your limit will hit. I had to try it a little bit anyway, but didn't take long to see that yes, it's too good to be true that orders would be filled as quick as the Sim system. So now I've spent a couple of weeks in the trenches learning the hard way what is a trend and what is "noise", analyzing charts, evaluating support and resistance and trading ranges, winning some, losing some, trying to make the winners outweight the losers. Another couple of years and I might actually know what I'm doing!