They've been successfully recovering boosters of the Flacon 9 for around two years now, which drastically reduced costs. Now they're going bigger, but it is much harder. But this was a success, regardless. They sent the payload even further than planned (as they just burned off all the fuel in the second stage), and landed back 2 out of 3 boosters. And that footage of those two landing in sync was just ... orgasmic almost :p