Their rate is 3.6 btc / yr thats correct? If so, its worth imo, but a lot of people say its a waste of time and they are very hard to handle and setup, idk if they tell this just to discourage new people get into mining
Im planning to get 5 Asic R9's, please note that I have Free energy, what would be my costs besides the miners cost?
Are they really hard to setup? They have a decente life-time?
If you do have free electricity then it would really be a profitable mining thinking off that you would have already a free electricity but I'm wondering where those free electricity come from? but well its my own business though.
If you don't have any problems in electricity then you should pay attention on the maintenance and thinking off that you don't have a guarantee that those miners would last long depending on how you maintain them.