I have the Harvey Shark mounted to my K3 Winner 79x48.? It was expensive, however the quality is there, in my opinion.? This thing is solid!? It is also very adjustable, which I guess is good and bad.
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It works fairly well, although I think some of the performance would be better if it wasn't for how my dust collection pipe is routed (it's awkward due to space limits in my basement shop).? Their setup goes from a 4" inlet down to a 3" pipe, down to a slightly smaller hose, and then down to the narrow guard housing, so that might also play a role as well.
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I mounted it by screwing a block of wood to the back of the rightmost (i.e. small) extension table, and then attaching the support arm underneath that.? It has its own foot, so that helps deal with the weight of the unit.? I love the fact that I can just push material right into it and it just goes up on its own and stays there.? I also love the fact that I can leave my riving knife mounted all the time.? Note that the riving knife that comes with the saw that holds the default guard *cannot* (or maybe should not) be used with an overarm mount, as I believe the top of that is thicker than the rest of the knife.? You'd have to double-check though; I bought a new "standard-style" riving knife when I got the Harvey Shark.
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The biggest drawback is that in order to swing it out of the way you have to walk around the saw; there is no quick release-type concept.? And with my tight setup it's actually even more difficult to reach the lever so that makes it even harder.? You might not have that limitation.
