I have been using Altium Designer software for CAD for a year. Suitable for designing circuits and PCBs ideally. Very smooth ride without jerks. I use a Razer Sphex on a mat. Comfortable, fits perfectly in the hand. If you put two batteries, it becomes pleasantly heavy. I use lithium - I haven't changed in a year. You can set up several modes of movement speed and select them by clicking the button on the mouse. The logo is erased over time, but does not interfere with work. The only thing missing is a Unifly universal receiver to connect a keyboard to it.