This chair is pretty comfy, I don't sit in it all day, just on occasion so I can't speak to long sits, but one thing you should not before purchasing is the sizes of both the seat and the back as I was surprised the small size of both when it arrived.  The seat is not very wide at all, and as an average built 5'7" person I wouldn't recommend it for anyone larger than myself.  It just wouldn't be comfy width wise, as there's maybe 1" left in the seat if I'm being generous.  As for the back height, even though it is low, I find that it has more than adequate support, it's just that we are accustomed to high backs these days.  It looks great in the room.  Just be careful about the sizing that's all.