According to ICO Drops, Envion scores MEDIUM considering everything. They score the Hype Rate very high, the risk rate normal, but the ROI rate low. This is the information on 1 Dec 2017 at https://icodrops.com/envion/.

I am a little surprised about the ROI rate. Envion is claiming 161%. We all know the proof is in the pudding, but I would love to know why Coin Drops is rating the ROI low. Coin Drops don't motivate why they give these scores. According to them the ROI Rate is defined as follows:
"This parameter shows how much the token can grow after its exchanges entering. It means short-term and medium-term growth. The parameter depends on the ICO conditions and results of similar category projects in the past."
Maybe it's the past failures keeping the ROI score low?

Except for the ROI rate, I think Coin Drops are happy with Envion.