I want to start this thread to see if anyone has had problems with ARCA on the FIX side of execution. Basically to sum it up: They are the slowest of all ECNs. Their technology is through Townsend Analytics and all it has caused is grief for us. My fear is that with this integration with REDI systems, that the integration of the two ECN's will be used on ARCA technology. If that is the case and the executions are as slow as they are now (1 second and over), I will have to change my business models and go somewhere else. Anyone else feel like I do?