Recently, I played a match where my opponent called every.single.line.shot.out. I mean I could clearly see I was on the line, but all I heard was "long"...."wide"..."out"... I joked couple times "chase review please". It was very frustrating to say the least.
So, I agree with others - while sometimes it's hard to see if it was in or out, I always give it to the opponent. Unless opponent is like the one I described above...