While there are a few red flags about the exchange, it has been in business for about a year and a half now with no major incidents or controversies. The lack of transparency is suspicious, however, and its leadership seems to be weak. There is also the lack of support for fiat currencies, as well as the lack of margin trading which is becoming more and more popular.
But, the exchange does offer some pretty popular coins, and it has low fees, so it is not surprising that its daily trading volume reaches $1 billion.