Many are still using this exchanges, so i think its safe, but im not 100% sure, because we all know, all platforms have its disadvantages and advantages so better for you to take caution in every exchanges you wanna trade. Much better, you trade to other exchanges if you are hesitant in etherdelta, i know there was an issue before that a lot of users were hacked and lost their ETH, so learned from it. Trade only if you think you needed to trade.