Ive been using Hashflare Mining for bitcoin for about a week + and i have had absolutely no problem with the platform. They also have a few other Altcoins you can MINE. I did a trial run of $55.00 contract for 3 years. One time payment and i am averaging about $1+ so $30+ a month. I will have my oringinal loan paid back in about two months and still have a 34 month contract left. So im impressed for now as long as they dont get hacked or something crazy. I also reinvest automatically, there is a button to do so and it will reinvest for you as soon as you meet the min amount.
You can check it out or sign up here.
https://hashflare.io/r/8103566F