The one for my Egnater was solid metal, but the actual electronics and the switching jacks were utter junk!!! They eventually broke on me and half the cab would intermittently die; and I'm guessing the ohmage was changing because of it too. I took them out and hardwired a jack in, job done!
My Marshall cab has one of the deep dish thingymajigs....
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I fucking HAAAAAATTTTEEEEEEEE these things!