Not worth the risk at all. They have notoriously poor customer support. Their wallets are always in maintenance mode and the maintenance never seems to end, so basically at any given time, your money could be essentially frozen in yobit with no way out.

Anyways, everything that yobit offers can be done with a better exchange like bittrex.

Unless you want to trade shitcoins, then don't use yobit. And even if you trade shitcoins i wouldn't recommend storing the coins on yobit itself. Store it in your actual wallet.