"I have one of these and I never got to second think the design of the device, but I think they really put effort in the ergonomics of it. For instance while holding it with both hands in front of you, you can turn the knobs by using your index and thumb fingers. It can also be easily held with one hand with the device laying on its back and then you can crank the lever with no obstruction. The overall build quality is average at best, but I can testify the thing is sturdy. All things said, it is a fairly good product, meant to be cheap, not the best."