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I've hung my 576xp from it briefly and it was fine. Haven't had the 660 on there yet. I haven't tried a tree motion but what the onyx lacks in padding it makes up for in support. The way the webbing is stitched gives it some stiffness and spreads the load out. All this being said if I was swinging around a big heavy saw all day everyday I would look into some sort of suspender/ chest harness setup. The new tribe one is simple and inexpensive, but any setup with one rear and two front attachment points should work.