I run nVidia and Intel. GeForce GTX 760 and a Intel i7 4770K. I had one random crash that was fixed by disabling one video option (nVidia HBAO, cannot tell the difference in quality of graphics after disabling.) I have not once experienced a frame rate dip that made the game unplayable and I am playing at highest settings. I have heard that AMD users have been having issues and according to their latest patch (1/30/15) it is a known issue and they are "working on it." So take that for what you will. I only played Dead Island (Also by Techland) and it was on PS3 so updates weren't pushed a lot. So I cannot really comment on Techland's history with coming through on their promises.
As far as the game goes I enjoy it. I am getting the feeling that the story might be a bit cliche and similar to Dead Island's. However, I think they implemented an open world system and a combat system better than Dead Island. From any review I have seen, Techland isn't really known for their story telling. The game is relatively easy during daylight hours. Meaning you might die some, but most of the time it will probably be because you did something silly to get yourself killed. Once the sun sets though, totally new game. I am absolutely terrified while the game is during its night cycle. Its a mix of trying to stealth by some rather nasty improved zombies (that only come out at night) and running scared shitless when you manage to attract one of them. I have heard that the game is more enjoyable with others. I haven't played a whole bunch of the game, but I am excited for the combat/running like a scared little girl aspect of the game. And I would love for someone else to scream and cry like a baby with me.