Let me talk also about my experience because i see some not good posts here.

I was worried also that they don't offer the buy back programm and they are doing it. Let's see how the operation will be done and if it's well 2$ per token.

I always received answers from the Dias up to now.

To my opinion, for "crowdfunding mining", this is a serious project. It's your responsibility to check if this kind of offer matches with your investor profile. (risk lover or not).