Non-existent customer support.
The dashboard view was confusing at first, so I was trying to contact customer support for several days with no response. I'd only invested $125 so it wasn't a major panic, but I can only imagine how somebody investing thousands would feel about this lack of a response. I managed to contact them instead through their sales department and got a quick response and everything now seems to be fine. I can't say whether or not I'll be paid until the year is up and considering the slowness of customer support, I'm giving this a 3 star rating for now.