Because of the price of eth too difficult to predict and always fluctuative, so in my opinion, this time is good time to buy and investation in eth. It is because the price of eth still cheaper in the range $205 per coin and i optimist the condition of market will be better and the price will be incrase drasticly again in the end of 2018. For long term investation, invest in eth still worth it and the price will be more valuable rather than today.