Reputation
Huobi has been open for business since 2013 and has never been hacked. They were primarily a Chinese exchange with CNY currency options but have since moved into the global market and USDT. Customer experiences vary, with the usual sprinkling of salt, but our experience is that exchange is fast, secure and functional. The exchange moving away from China and into wider market-places, along with a massive increase in available coins and tokens over the past year or two shows they are making big successful moves in the crypto market-space.
Security
As you must expect from any exchange, 2-Factor Authentication (2FA), is available with Huobi via SMS or Google Authenticator App. Note: when starting a new account on any exchange it is extremely important to enable 2FA as soon as you create your acc. Huobi has never been hacked, showing their security is up to task.