Glad to hear about this outcome. Those codes are used on several platforms (BTCe on my memory does them, too) but I did not found the place where to redeem them. Been /en/yobicodes/ or similar.

Regarding their reputation..
They are listing each and every coin since it's their main bussiness model offering trade services for a small registration fee from coin developer. Of course that attracts a whole disarray of short lived projects. And a maintenance nightmare on keeping all wallets / blockchains in sync. Not to argue about the more shady coin devs who could publish backdoored wallet software that needs to be kept in a secure distance onto any serious deposit.
I am pricing that in. As a result, mostly spare money trades over there. Cant help it, that has become yobit's fate.