Is bitFlyer legit or not?

Can anyone here confirm the legitimacy of bitFlyer as a cryptocurrency exchange? I've been hearing mixed reviews and I'm hesitant to trust my funds with them. What are some of the key factors I should consider when evaluating the reliability of a crypto exchange? Have any of you had personal experience with bitFlyer, and if so, what was it like? I'm particularly interested in knowing about their security measures, trading fees, and customer support. Can you also share any red flags or potential risks associated with using their platform?