I work in construction and used this tablet for my business to protect it. The rotary knob on the back works perfectly and is quite ergonomic. The only criticism I have of this product is that the rubber corner (shown in the picture) is starting to peel off due to the weight of the tablet. I would suggest reinforcing the edges that the tape goes through. Bought because the same thing happened to my colleague. Now I don't use the belt every day for check-ups. It was mostly twice a week, and a few weeks even earlier. Overall good product.