The MBR doesn't create a wired ball out of thin air. All it does is freeze the balls.
There is no special material that makes one frozen rack send balls into the holes, but another frozen rack send balls into the rails. Frozen is frozen. It's that simple. The balls barely even touch the material anyway, they're sitting in holes.
When the balls are all touching, certain shots (like the 9 ball wing ball) are very very easy. That's not the MBR's fault. Blame the guy who invented that diamond shaped rack, whoever he was. That wing ball was flying into corner pockets for years before the MBR even existed. It flew in with the Sardo. It flies in with the delta 13 too.
Those easy wing balls will fly in using ANY rack, even a basic plastic one, IF you take the time to make sure every ball is 100% frozen.
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I'm not knocking your rack, I haven't tried it yet. But I'll say this... however your rack works... if I am not easily making the wing ball, it means your rack is failing to freeze the balls, and I'll be glad to point to the gaps if you don't see them.
I don't think badmouthing magic racks is going to be a very effective marketing tactic for you, especially if you make up crap about them wiring balls balls that normally shouldn't go. Those balls always have been wired, on a perfect rack. The MBR just gets you there fast.