The advantage is you gain peripheral view. The drawback is that objects in front of you are physically smaller than they would be at a narrower FOV. Larger FOV's are more comfortably played on larger resolutions on larger screens to offset the shrinkage. That said, I prefer 90 in-game FOV setting which I believe is vertical, and results around 120ish degrees on my 28" 1920x1200. On my 22" 1680x1050 I like an FOV of 75-80 vertical.