Kensington Orbit Trackball Mouse with Scroll Ring (K75327WW), Black-Grey

Customers find the trackball mouse works extremely well, with a fantastic scrolling ring and smooth operation. They appreciate its ergonomics, being perfectly ambidextrous and easy to use, with one customer noting it makes working on spreadsheets a breeze. While some customers find it comfortable to hand, others report it's uncomfortable to use. The button functionality receives mixed reviews, with customers noting the buttons are hard to push and there's no middle-mouse button.