I used both Global Futures and Strategy Runner for about 4 months. When ever I called Global Futures I got a quick response. I have no complaints. Strategy Runner is a decent platform, but not if you are trying to scalp the market.
I am currently doing a demo with Dorman Direct platform and Transact and their market orders go throught almost as soon as I click my mouse. Strategy Runner was a little slower. Of course it only matters it the market is moving quickly.