Customer support is pretty top notch in my experience. I've never had to wait to get a human being on the other end of the line. Pretty easy UI to grasp and if you want more information, it's there if you want it.
Their take on the robo-advisor trend requires a $5000 minimum deposit, which, for a starting investor (especially if it's someone just starting their first retirement account) might be a bit much. Considering people are limited to $5500/year for a Roth or a traditional IRA, putting $5000 in there for a first-time investor might result in bad timing. Obviously not an issue for more established investors but it still needs to be said.