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I've been running one of these for about six or seven months and I thought I would make some comments.
1. Sometimes, just turning the knob registers as a push-turn. As far as I can tell, this tends to be more likely after pushing the knob for some other reason (e.g., a push turn, a push, or a push-hold). The good thing is that such an error usually only happens once, so subsequent turns are indeed registered correctly; only the first turn is interpreted as a push-turn. Also, it doesn't appear to be a function of the mechanical parts getting stuck in the "pushed" position. I believe this because the error will occur even if I pull up on the knob after it has been previous pushed down. It's a little annoying but I suppose you can't expect much for $20.
2. Pushing on the knob will wake my Mac Mini from sleep. I don't think this is due to anything particular with the powermate, just a property of USB devices on Mac Mini's. Although, I suspect this has been a reason for at least one drained battery in my car. I think this can be resolved by connecting my USB devices to a hub that is powered solely by the power supply and not the mini so I plan to go that route eventually.
Just my 2 cents...
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