First Stage In Flight
Successful Stage Separation
Second Stage BurnYeah, yeah, it's just a test. But the cost of the entire development program (~$335M) for Falcon 9 is the same as a single test flight for Ares I-X (~$445M)...
From my perspective (as someone who's sat in the hot seat conducting flight tests), the really impressive thing with the SpaceX operation was their ability to light the engines, auto-abort, and turn a new countdown/launch at the end of their range time. There was clearly a whole lot of work in the design phase leading up to the impressive execution today that made saving the mission possible. Nice.