I don't hear anything about them, and I don't use them too. If you think that they are stored all of the assets in the cold wallet, then it is better if you can do that by yourself because you can control your assets and you can directly to access the cold wallets. You don't need them to store your assets because you don't know how good they were securing the assets. If I were you, I would not store my assets in the exchanges for a long time especially in the new exchange because I don't know if the exchange can really protect the assets from the attackers or not.