Cricket has to be commended for trialling modern technology, but they've got to do a better job than the referral experiment in the West Indies v England series. If you're going to make the crowd wait for a decision, at least get it right! There have been some dead set shockers so far, and it's only the first test of the series.
You can't expect umpires to be perfect when they only see the action once, at full pace. But when the bloke in the box with all the replays can only do worse, then what's the point??