This is an okay wall mount. It comes in a simple plastic bag with no screws or anything, it's fully made out of plastic, but for the price you can't expect much more.
In terms of stability, there is nothing that I could complain about as it is holding my super heavy Jazz bass with no problems. It is about as reliable as it gets and I'm not worried about my instrument's safety in any way.
The only truly annoying thing about this mount is, that the rubber is wearing off and leaving black stains on the white binding and the nut of my guitar's neck. Furthermore, the mount, albeit sturdy, does feel quite cheap.
If you use the guitar accomodated by this mount often, I would reccomend going for a more expensive alternative. For the guitars that you take off the wall occasionally it's just fine.