Maybe I am missing something. I see lots off guitars for sale where people say "Locking tuners added" I have never felt the need for locking tuners but I have never had a guitar with them. Is their benefit keeping strats more in tune if one uses a whammy bar? Is there something that makes them better than regular old tuners? What I am missing? I think they are heavier than regular tuners so there must be a benefit- do they keep guitars from going out of tune?