They do their job, but the metal used is a little soft. This makes them very easy to damage in their installation or during normal use, in the coupling and decoupling of the guitar.
The system itself in the fastening to the strap can cause the tightening nut to easily come off. which can lead to it falling and getting lost, which is not good.
Verdict: ALL guitars to be used with a strap should include strap-locks.
These fulfill the function for a light use at home or small band rehearses, however for more regular and intensive use, I would buy more expensive, higher quality ones, to have more peace of mind in its use.