This exchange is very useful for raising the price of a token that has just debuted. for support, it is also very helpful for users who might be in trouble.
But I never faced any issue at that time on poloniex and still I am using it. A simple and sobre exchange UI and its very good for beginner and advanced charts also for hardcore traders. I am active on Poloniex and my funds also there from long time. No tension exchange. And now Poloniex is in hands of Circle team so definitely it will more better and sophisticated for sure.