FAST 1.0 came out years ago, but I can't find anyone who offers it for data feed or execution. (Well, saw somewhere a hint that Genesis might, but I am not thrilled about the idea of dealing with any place that doesn't have up-front prices and seems primarily focused on co-location.) I messed around with the TWS API a couple years ago, but I never managed to get anything usable. I'm interested in FIX and FAST for portability, but also for stability and predictability. FAST obviously makes a lot more sense than FIX for data feeds, yet it is strangely absent from the marketplace. Does anyone have any experiences with either?