They are pretty impressive in crossfire, especially in Metro, I thought there was something wrong with the results when I saw they were on par with a 590/6990
If you want a cheap crossfire set up for £202 two of these are worth it, but for a single card, as said in the review the 6850/70 are the better cards to go with.
NZXT Switch 810 - i7 6700K - MSI Z170A Krait - 32GB Corsair Platinum SE - MSI 1070 - Crucial MX100 256GB SSD - Samsung F3 1TB HDD - Corsair H100 - Corsair RM1000i SE - Asus VE247H
PC Audio: Asus Xonar STX - Sennheiser HD650.
Portable Audio: FiiO X3II - Audiofly AF140 - Etymotic ER4s - Fidue A83.