Was out in Dubai last few days meeting eurex and deutsche bourse about their new hub there so late reply. It was a fills confirmation slowdown at eurex apparently so would only be noticable if your were trading at market in those couple of seconds, you wouldn't have seen it in the price action. But overall I say there are far fewer cases this year, in fact that's been the only one so thumbs up.
If you are autospreading on Eurex and dont have the new feed then you only get price updates every 250 milliseconds rather than realtime. This means if you are competing against a system with realtime then you will be miles behind the others. I know RTS and Ecco have it. Not sure about the RTS spreader but Ecco released it this week, and thats supposed to be better. Rumour is they have Dutch and Irish auto-spreaders already on it...Havent heard of any US or UK, but they're hardly gonna tell anyone!