How legit is BitMEX?

I'm curious about the legitimacy of BitMEX, a popular cryptocurrency derivatives exchange. What kind of reputation does it have in the industry? Are there any regulatory concerns or red flags that investors should be aware of? How does BitMEX compare to other similar exchanges in terms of security, transparency, and reliability? Are there any user reviews or testimonials that can provide more insight into the platform's performance and customer service? Additionally, what measures has BitMEX taken to ensure the safety and security of its users' funds and personal information?