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...
5 - 8 watts is my guess, but I don't have a wattmeter to measure though. The drives are active for 30 seconds every 4 minutes, and will use your cpu or gpu to scan the drives. Maybe 20 watts extra during scanning.
I grabbed the seagate 8tb archive HDDs, they were $170 on black friday Amazon US.