Well I played with mine this morning and they are simply ok and less so for the price.
They feel flimsy out of the box but when you place them on metal the stiffen up and a quite solid.
Here is a 7mm thru 20mm 90's CM raised panel set.
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The larger raised panels don't fit right and are not as secure as I was hoping. I was really looking for a solution to my taco wagon at work that I roll around the plant on concrete and wood block. These don't have enough magnetism to the tools. The widgets have enough not to move.
Here you see a 24mm CM RP in the second to last spot and an early 80's snapon oex 1 1/16 in the last spot. Snap on fits well, CM not so much and larger ones would not allow this shallow lista drawer to close.
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Also one of the magnets came out on the first time in the box. They are superglued in and I believe they should be epoxied or maybe even a good industrial hot melt. Not a super big deal but hey.
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My opinion is they would be decent for a box that doesn't move a lot over rough terrain and I wouldn't use them with RP wrenches. I really wish to that they were wider as well. Even a 1/2" would be better but twice as wide would be awesome. Of course you could put two set together but 38$ for a wrench rack is getting outrageous.
I personally dislike Ernst rails and their issues. I guess I will have to makes something custom with some uhmw, magnets, and the unisaw. I was so hoping for and off the shelf solution.