I have the key role since a good 2 weeks use, active 6 days a week to each to 5 hours. So far, there are no approaches to neurological deficits, my flashlight (137 g) is loosely held / hoisted. As noted by others: If you unpack it and has not seen before, you get a little shock, because the key is something larger than suspected, but it works perfectly so far. Disturbing the belt, the key role is not, as sometimes bothers me even more the flashlight. Would I buy it again.