Yobit, their support is very very slow (your response even not to get solved for a long time if you have some problems on there). Beside of that, their volume also looks like faked by pump and dump. Better to stay away from them
I've seen few people that actually received reply from yobit and that's a very rare case. Someone received a reply after three months IIRC. And that's really inconvenient for someone who's looking for a good exchange.
These reviews will help other traders to look for the best exchange that they can stay. As mentioned, avoid also those exchanges that has fake volume. There's a tendency that they will scam your money in the future and that can happen through locking your funds/account.