CPU: Intel i7 4790 (Stock)
GPU: R9 295x2 (Stock)
RAM: Kingston HyperX Beast 16GB 2133CL12
Motherboard: MSI Z87M-Gaming
Storage: Samsung 840 EVO (OS)
Storage: WD 1TB 7200RPM (Game)
Display: Dell P2415Q 4K
VSync ON @ 60 FPS
For the most part performance was spot on, although I was disappointed to discover that 4K wasn't supported. The game does upscale at 1080p on larger screens, however if you Alt+Tab out and back in, the visible portion of the game will then shrink to its actual area in pixels (you end up with chunky black borders). I also noticed a distinct slowdown in performance after tabbing out, though besides benchmarking I never particularly felt the need to do so. Aside from these small issues, the actual gameplay and core content appears to be totally bug free. Essentially, if you have no intention of doing anything besides playing through the game, it should be smooth sailing.
For reference, you can see how your GPU will perform in comparison to ours with this set of charts.
NOTE: Precisely 50% GPU usage means only one GPU was put under load on the 295x2. This may indicate a lack of multi-GPU support.