For a long time the OKEX exchange was one of my favorite as there are a lot of features such as native tokens, margin trading and yield generating products. The best thing is that there are a lot of promotions. I was able to get free Satoshis every one of the days. There are free BTC each friday for holding certain amount of crypto (100 USD worth). The main issue which scared me was that in the October 2020 I was unbale to withdraw funds and the situation seemed very threating. I was not sure if I will be able to manage my holdings worth a lot of USD. It has been fixed but still I am not convinced now. Moreover they have lower everyday free Satoshis bonus.
I would like to mention that there is a good liquidity (enough users), enough trading pairs, reasonable fees.
The customer support could be better as they are unable to communicate their issues properly.
Overall this is a great exchange but be vigilant and do not move there all your holdings.