I signed up for a demo of C2 with Open E Cry. There is a 14 day free trial. The process to set it up was pretty simple and the interface has been seamless...so far (only been on it for 5 days). They even provided me with a read only eversion of OEC's softwaer so that I can monitor trades real-time, which is a pretty neat feature.
As long as you are trading electronic products any of their Gen 3 interfaces should work pretty well, from what i have been reading.
