Locking tuners have two advantages implemented by their fundamental mech.

1. They require fewer string winds on the post because they utilise a mech securing the post and string, not because the post is shorter. Once users learn to restring locking tuners properly, restringing is quicker. [u]This is a secondary benefit[/u]. There are different types of locking tuners.

2. Their [u]primary purpose for deployment[/u] is for improved tuning stability on tremolo equipped guitars by reducing string slippage ocurring with conventional tuners induced by repetitious tremolo application.

The disadvantage is that they are more expensive leading to them not being commonplace factory fitment on lower price point or even many mid-range guitars where not prerequisite to function.