However I feel like difficulty is going to go up by 30%(S2 miners coming online soon, and tons of S1s sold due to price drop) per diff change, which makes it 5 months till ROI again.
imho the difficulty will slowly jump also when the s2 will be delivered: 1-2 phash now is like the 4-8% of the bitcoin network hashrate, not so much to skyrocket the difficulty
Bitcoin Difficulty: 4,250,217,920
Estimated Next Difficulty: 4,876,053,400 (+14.72%)
Adjust time: After 588 Blocks, About 3.6 days
Hashrate(?): 36,467,128 GH/s
Block Generation Time(?):
1 block: 8.7 minutes
3 blocks: 26.2 minutes
6 blocks: 52.4 minutes
Updated: 16:25 (5.7 minutes ago)