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.

$170 is very low price i can't find that model of 8TB at just $170, on amazon i see 270 euro for that, which is too high for my taste
how much is the consumption exactly? 6watt?
btw if i can find them at your price, it is worth a shoot indeed...