Reviews here:
https://goo.gl/pvHBpr (ptbr)
https://www.facebook.com/newbiebitcoins (reviews always updated)

Low Risk: (All Paying)
https://goo.gl/cyB2mt - HashOcean (review on)
http://goo.gl/iSPQgc - BitsRapid
http://goo.gl/onbCiy - BitcoreMining
https://goo.gl/01l0aT - GenesisMining

https://goo.gl/gfoM71 - TopMine
https://goo.gl/1B8TbB - Hashflare
http://goo.gl/ahSPdv - BitcoinMining
https://goo.gl/n431Jn - Otiis

Medium risk: (All Paying)
https://goo.gl/ztLQNp - BitStrategy (review on)
https://goo.gl/BQqHmT - GoodlyBit (review on)
https://goo.gl/hdVG4B - BitMinister (review coming)
https://goo.gl/7OJGir - BitcoMiner

New - Medium/High Risk:
http://bitbin.it/eYg9RxXn/