>>ColinW+(OP)
At an absolute minimum this flight has shown that SpaceX is capable of testing reuse of the first stage on operational launches (including use of landing legs on the first stage) with no impact to the launch (provided there is sufficient payload margin, which there will be on any further Dragon launches). That's a big deal, it means they get tens of millions of dollars in free testing subsidized by their customers, and that gives them a huge leg up in working towards reusability.