What are the disadvantages of OKX?

Could you please elaborate on the disadvantages of OKX? Are there any concerns regarding its security measures? How does its customer service fare in comparison to other cryptocurrency exchanges? Additionally, are there any significant fees or commissions associated with trading on OKX that investors should be aware of? I'm also curious about its user interface and whether it's intuitive and easy to use for beginners. Lastly, what are some of the most common complaints from users of OKX? Thank you for your insights.