Yes, many people have in fact run it in "real production". Go ahead and Google my name for credibility. There were indeed issues with the 0.7.x series of Marat

Yes, many people have in fact run it in "real production". Go ahead and Google my name for credibility. There were indeed issues with the 0.7.x series of Marathon, but we've made a big effort to focus on stability and performance in 0.8.x, and onward. As with any new software project, there tend to be issues in early releases.