Review on Kensington 🐭 Expert Trackball Mouse by Obhed Leblanc

I've been using this trackball model for many years and have had 2 in the past. Recently bought a new one but it's not the same. Sometimes when I press the bottom left button it squeezes the scroll ring and lets it scroll a bit. It's rare but it happens maybe 3-5 times a day and it's very annoying. I sent it back and bought another one. It's better, but it still works the same. The problem seems to be that the rolling ring has no latches, it moves smoothly and easily. Sometimes the scroll ring stays in the position you want it to scroll and then when the bottom left button is pressed the scroll ring scrolls. This is very annoying and I am very upset that my favorite mouse device now has this defect. :(