Excellent stability and strength
I used the wall hanger for many years without any problems.
In general there are two things to consider when using a wall hanger:
1) Attaching the hanger to the wall strongly so that it does not sag over time
2) Covering the wall with something soft so that the guitars are not accidentally damaged by hitting the wall.
This product comes with long enough screws which help with the first point, and has enough clearance to help with the second.
If you are careful when placing and removing your guitar, you don't even need to cover the wall.