Very good article. I do like your objective view of things. So, I’m very curious to know your opinion about cloud mining. Do you think that every corresponding service is priori a scam or there are some trusted ones like Genesis or hashflare for example. What’s more, I would really like to know what you think about promo codes. Are they real when we speak about cloud mining or not? For example, these ones http://hashflarecode.com/