Definitely positive experience with Mirus
I've used Mirus Futures since 2005, among 2 other brokers, and my experience with Mirus has been very good, if not the best, all these years. Their customer service has been real responsive and helpful, wire transfers always promptly taken care of and I don't really have any complaints about their execution speed (Zenfire) or commission fees. I've seen a few comments here about connection problems or lagging price feed with Zenfire, which I must comment I haven't really experienced them myself. I trade CL (Crude Oil) and I've only had 2 lost feed/connection over the last 12 months, both very short lived, no big deals really. If you are an active, serious trader I definitely recommend Mirus Futures.