I applaud the effort but is this really "big data" - the largest data sets they seem to test are ~150GB, that would fit comfortably on my Mac Book Pro a number of times over. Many of these systems being tested are designed to scale efficiently when the data starts peaking > 5TB and therefore I am dubious about the median response time results - things that work well for small datasets (where small is defined as < 1TB) easily fall apart when you scale them up a little bit more.