Summary: A great performing card! This card is basically a rebadged 7950, and it performs closer to it than it does a normal 7870. Because of this it also can't be crossfired with the 78xx, but only the 79xx cards. I've been using this card for over a year, and it still plays everything I throw at it. I probably won't upgrade until well into the AMD 3xx series cards are out.
Summary: I use this card for Distributed Computing projects which require good FP64 (aka double-precision floating point) capability. The 7870 XT has a variant of the Tahiti chip unlike other 7870s which use the Pitcairn chip. Tahiti has much better FP64 capability than does Pitcairn. If you plan to use the card in a similar manner, the 7870 XT is a good deal.
Summary: After a number of less-than-heartening experiences with AMD's Radeon products on Linux, I had largely given up on using them. I am glad that I tried one more time: this is quite a nice card, and it works great with Linux.
Summary: I picked this because it had the best passmark score/dollar in the class of cards I was shopping. Well worth the money spent. Can play Crysis 3 with full-specs and am getting roughly 310 MH/s in crypto-coin mining. Worth the money when I'm gaming and is slowly paying itself off by mining. Good buy all around.
Summary: When I first got the card it was DOA. Didn't work and I literally spent 10 hours just trying to troubleshoot. I tried uninstalling my previous drivers from the old video card, I mean everything. Then I got the new card. No disappointment. I was so glad that I caught it on sale for about 140 dollars. It has run the following games on the maximum graphics: Farcry 3 Tomb Raider Bulletstorm the Darkness 2 Bioshock Infinite I mean really it is an awesome deal.
Summary: Awesome product and whisper quiet. I have my computer on top of my desk and I hardly hear it while surfing the web or watching a movie. Plays all games I have on High to Ultra graphics; I couldn't ask for more.