I have had to purchase an Ergo M575 trackball mouse to replace my M570 as it is no longer made. On my M570 the left click button wore out and caused multiple clicks each time a single left click was made. That previous iteration M570 of the trackball mouse was far more accurate and easy to adjust its accuracy. The new M575 sucks as all you can adjust is mouse pointer speed. The Logi Options+ app needs the old orienation set up added to it as well. Hard to land the pointer where you want it.