We're looking to trade listed derivatives globally, and we'd like to kick the tires of all the vendors. Before hearing the various sales pitches, it would be nice to hear from actual users first. Does anybody have any experience with these platforms? Any opinions at all (robustness, stability, reliability, GUI, client services, dev team)? Do you know if any can feed market data to multiple strategy servers (apparently with TT, we need to subscribe to a different XTAPI for each strategy, which gets to be pretty silly with a dozen machines each running a different strategy). Any opinions are welcome and appreciated.