As a result, the wheel adjusts quite remarkably and you get used to it. After six months of use at work, I took the same one home, I am 146% satisfied. Has some pros: The sensor is great, pure buzz, probably works on any surface - on the knee, on a towel, on the perforated top cover of the system unit. Cons: Wheel: I expected more . it does not always behave evenly and predictably. You can adjust to some extent, it saves the situation a little.