How legit is BitMart?

I'm curious about the legitimacy of BitMart, a platform that's been gaining popularity in the cryptocurrency space. Can you tell me more about their background and reputation? Are there any red flags or concerns I should be aware of when considering using their services? Additionally, how do they compare to other established exchanges in terms of security, fees, and available cryptocurrencies? I'd appreciate your insights as a professional in the field of cryptocurrency and finance.