I'm on the wait list, not in my state yet but will use them. Coinbase's perhaps greatest growth factor has been the commission they pay to refer new users, but Robin Hood also has a commission (a free stock) so they are competitive in that way also.
And it's not just Robin Hood, Bittrex is also becoming a fiat gateway. I honestly don't think CB's days are numbered (just their near-monopoly) and I seriously hope that they'll up their game finally to be more competitive.