In the time I used Poloniex, I personally never had any issues with the exchange. Still, the widespread issues brought up on forums and from friends were enough to make me withdraw my funds and use different sites. If you’re looking for a site very similar to Poloniex, I’d recommend using Binance instead.No tension exchange. And now Poloniex is in hands of Circle team so definitely it will more better and sophisticated for sure. See full review