The Robinhood iOS interface is really excellent, though they provide way less technical tools and analysis than my traditional online brokerage. However this is to be expected since Robinhood is targeting non-pro/power users.
Trade execution time and preference has actually been solid on Robinhood, though untested in a highly volatile situation where liquidity could be an issue for non-institutions and professionals.
Shameless plug (I've posted it before), but here is a blog post I wrote on leveraging capital using Robinhood Gold (margin) for those who are interested:
https://justink.svbtle.com/leveraging-capital-using-robinhoo...