I am mining with HashFlare since June 2016. Investing into lifetime SHA256 and Script contracts. Invested around 2700USD over period of 9 months. At the day of today I nearly mined as much as I invested. On February 2017 they have improved hardware and scripts and BTC price rocketed up in price. So it gives nice return since. Problem is that they don't offer lifetime contracts anymore and all my hashflare bought be for they cinverted to new 1y contracts effective from 1sep 2017. Quite illegal step taken from their side as terms and conditions shouldn't affect egsisting purchases. They just fooling their investors (means Us)

I hope that will clear out your doubts in case of investing.