-You are right , now days the biggest difficulty is which miners to go with as there is so much of competition going on between the miners where they try to compete with each other and this results in everyday changes in the technology and inventions of the product .For a very long time the market was occupied with the Asic miners to this also there has come up a competition Promax7 and I have no idea how long Promax will rule the market and what will be the next after this .