While I'm sure there are ergonomic benefits to the heart-shaped form factor, I'll say I think this stand is quite nice on the wrist. It's about four inches in diameter and extends about an inch past my palm on either side. It's not as thick as I'd like for my chunky trackball (Kensington Expert, which is larger than the average mouse), but when I connect it to a Magic Mouse, which I used before I joined the trackball team joined, seems the palm rest is sufficient. Twisting it to look like an inverted heart gave me a little more trackball support, but I still wish it was a little thicker. It would probably be comfortable and enough for me to use with a lower profile device.
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