When bitcoinbrothers deploy their exahash miner in august bitmain and everyone else will perish. There wont be an S7; if i were you i would refrain from investing till the middle of august.
http://www.bitcoinbrothers.de/press-redirect/newsletter/newsletter-3-bitcoin-brothers-berlin-next-steps-to-launch-exahash-innovation-award-iot

The winter is comming!