I will be talking about GDAC which is a Korean based crypto-currency exchange platform which definitely is popular Koreans but not so for non Koreans as this platform do no support many languages which is of great disadvantage to most foreign
GDAC would have been a really good project if not for the language barriers as it is used by miners and traders mostly.
I had a really poor experience as i couldn't grasp much on it. It has a tightly controlled security and the wallet provided is being managed by Bitgo phase which is well experienced in Crypto source insurance
I would love if the exchange platform could work more on service delivery in terms of addressing the language issues and also working more on making it more open so newbies wouldn't find it difficult to operate and also get partnership with larger brands in other to remain active and relevant