[The Bard Rocks]

I am always annoyed to see a really good guitar played with one on the headstock - you can't read the label!

On my own, I leave them off when not being used. Unless it has just been restrung there is little need to tweak while playing. Years ago, I left one on a '67 D12-20 while it was cased and when I removed it, found the spot where it had been attached was far shinier the the rest of the headstock. It remained that way for as long as I owned it, and that annoyed me. With some tuners and nitro finish there is far greater concern.

My tuners stay in my gig bag unless I am actively using them. One and a backup are always with me, no matter which guitar I have at the time.