It's a sophisticated trading platform with great liquidity and useful features. It offers extremely good security, quite good customer support, and a simple sign-up process. Privacy advocates will prefer its lack of KYC identity requirements.
The only real disadvantage is the significant risk imposed by highly profitable trading. Beginner traders and those who just want to buy a few bitcoins should probably choose a different exchange.
For experienced investors and those who want to perform complex strategies, this is a great choice.