K&M 16280 White

Perhaps too early to praise, because they have only held my guitars for one week on the wall (and not crashed down), but they feel rigid, and with a proper mounting they will be reliable. I mean, the body of the product is rather small and the screws are placed only two inches apart. If you are going to mount them onto a lightweight wall panels, you should locate the wooden construction behind the panel and mount them to that, or use anchors to mount them to the panel only.
Consult your hardware store. I made 8 inches long wooden pieces, onto which I screwed the K&M, then mounted it to the wall. Maybe unnecessary, but better safe than sorry. I`ll let you know if they fail. The white model is great, because you can barely notice it, and because it (supposedly) does not hurt the nitro lacquer. As long as the guitars won`t fall down, the quality is excellent. I gave 4 stars for overall, because of the extra work.