I am a regular user of the Logitech MX Ergo, and regularly using an OSK with system wide mouse gestures (StrokesPlus). So, I do quite a bit of dragging and clicking. Even using the OSK when I can’t be bothered to reach for the keyboard. I have noticed in some moments after extensive use of the mouse, I feel cramping in the general area of where the palm and knuckles meet. The tension is short lived, as soon as I take my hand off of the mouse and let it rest for a moment. Using the different angles of the mouse while experiencing the tightness doesn’t relieve it. So I decided to try the Kensington Expert, to see if I can use it with my hands splayed out. Aand I’m not liking it. It’s difficult to position the mouse easily to use the OSK, and to hold the buttons down to perform a mouse gesture. Not sure how people use this comfortably. I find that I am reaching out and pecking at the buttons while I am resting the rest of my fingers on the trackball. Is it perhaps my hands are too small for it? What are other people’s experiences with the Kensington Expert? I’ll have to sell it on FB marketplace as I bought it online and can’t be bothered to return for a fee. No physical stores near me stocked this. For now, it’ll be back to the MX Ergo, but maybe I need something vertical with a trackball on top. It looks like Kensington also has their Pro Fit Ergo Vertical mouse, but I’m unsure of it.