SANWA Wired Trackball Mouse, Silent & Programmable Buttons, Ergonomic Roller Ball to Reduce Wrist Strain, Thumb Control, USB-C & USB-A Port, 600-1600 DPI, Compatible with Win, Mac, PC, Laptop, Blue

Customers find the trackball mouse accurate and of good quality, with smooth ball movement and a comfortable grip. However, the responsiveness and ergonomics receive mixed feedback - while some say it works well and feels smooth to operate, others report it hardly works at all and feels awkward. Moreover, the click functionality is problematic with unreliable activation and difficulty with double-clicking, while the trackball itself is very sticky. Additionally, the noise level receives mixed reviews, with some finding it quiet while others complain about the scroll wheel squeaking with every rotary movement.