I have a very strong opinion about LBW.

When I was an umpire, the batsman always got the benefit of the doubt.
Its too easy to lift that finger.
I can remember one very good slow bowler, appealing for LBW 3 times in one over. I gave not out each time. At the end of the over, he came up to me and quitly asked why I hadn't given the batsman out.
I replied, that when he bowled he stood right in front of me, so that I was unable to see what happend once the ball pitched. He thanked me and from that time on he made sure that I had clear vision of the ball pitching.