I'm mining burst with 80TB and it's pretty great, 40 cents a day profit per 8TB drive, each bought at $170. Electricity costs for them are negligible and they don't go obsolete that quickly.
Compared to my Rx 480 that makes a dollar a day, half of which goes to electricity. My electricity cost is $0.17/KWH
If you have good electric cost, go for GPU mining. If high electricity cost, you might want to diversify your mining equipment a litle.
