Never been a fan of them personally. This is where I believe that Barnsley got it right, ours is so small as to be useless for video replays etc but perfectly adequate to show the score. When I say "got it right" I don't think for one moment that it was planned that way of course...
Sheffield Wednesday making a fuss about this could actually get them in hot water. It's against the rules to show contentious incidents on the big screen because it can influence the referee. Showing a replay of a potential goal that the referee is still talking to his linesman about is a clear breach of the rule and they should receive a significant fine for it.