The Kensington Expert Mouse is in the upper echelons of the sturdiest/most accurate trackballs ever made, but it has a flimsy wrist-pad attachment bridge and th

The Kensington Expert Mouse is in the upper echelons of the sturdiest/most accurate trackballs ever made, but it has a flimsy wrist-pad attachment bridge and the sensor collects dust, requiring a thorough delinting every few months. Not a deal-breaker, but if your pointer acts erratically, clean out the enclave first!