Summary: I was a little hesitant to buy an MSI brand gpu because it seemed cheaper and the fans are tiny, but when this came up $220 for a refurb/used model (was brand new when I got it with two free games that they didn't even mention!) I couldn't hold back. If you are ever able to get a 670 over a 760 at similar prices, GO FOR THE 670!!!
Summary: I have had this card for almost a year now. It has only crashed once in its lifetime, and it recovered gracefully. The only reason it crashed was because I overclocked it a little too far. I haven't had the time or patience to tweak it enough, so right now I have it running stock, though. It plows through everything beautifully on at least 60fps on full graphics at 1080p (except for complex scenes in Crysis 3 where it goes down to about 50fps).
Summary: This card is amazing. For the value, I can play BF3, semi-ultra, and the card barely makes a sound. It is extremely quiet, has never caused problems for me, unlike an AMD card I had that caused constant BSOD's. I would recommend this card to anybody that wants a good card at a good price, and I intend to purchase a second one to run in SLI.
Summary: I upgraded from a GTX 260, running in a PCI-e Gen 1 x16 slot. The WebGL performance is similar to the 260 (I was hoping for faster), but now OpenGL 4.3 is supported. Great price/performance, it should keep me going for a couple more years. I've been unable to use CUDA since the Nvidia drivers don't support the latest versions of GCC (hopefully soon).