Now that Ed has bestowed upon me the ancient wisdom, I'll answer your question in the best way I know how...
I personally don't have patience for a locking system in any way shape or form. If I need to alter the tuning on the guitar or change the strings, I take it to my guitar tech.
But THAT'S because of my own personal choice.
However, let me say this...
I had both of my Dark Night and Black Moon guitars sitting on my guitar boat for 7 months after I got their setup done and new strings. This was because they were put into drop C and drop Db for my original songs but I needed to learn an entire set list for another project in standard tuning, so I used my Gibson.
About three weeks ago I went to pick them up to start in the studio again and they weren't out of tune at all. Not even one bit.
So after 7 months of just sitting there through temperature changes, not one tuning problem. Even after playing on them for 4 hours that night, I didn't have to tune them once
