I use one on my #1 P bass. They're useful, but I have to work it out and mentally "lock in" for each song I use it on. And I can't improvise worth squat with it engaged (across the neck).
Several times I've forgotten to disengage on the next tune, earning a nasty look from the BL!

HA!
I was 5s only for years, but have had to reduce weight post several surgeries.
Anyway. Gorgeous Stang!